diff --git a/app/views.py b/app/views.py
index e06dc3c..db89485 100644
--- a/app/views.py
+++ b/app/views.py
@@ -298,33 +298,3 @@ def semester_delete_view(request, pk):
 @admin_required
 def dashboard_view(request):
     return render(request, "app/dashboard.html")
-
-
-# ########################################################
-
-
-def handler404(request, exception, template_name="common/404.html"):
-    response = render(request, "common/404.html")
-    response.status_code = 404
-    return response
-
-
-def handler500(request, *args, **argv):
-    response = render(request, "common/500.html")
-    response.status_code = 500
-
-    return response
-
-
-def handler400(request, exception, template_name="common/400.html"):
-    response = render(request, "common/400.html")
-    response.status_code = 400
-
-    return response
-
-
-def handler403(request, exception, template_name="common/403.html"):
-    response = render(request, "common/403.html")
-    response.status_code = 403
-
-    return response
diff --git a/config/urls.py b/config/urls.py
index 1becddc..fbf2baa 100644
--- a/config/urls.py
+++ b/config/urls.py
@@ -47,7 +47,3 @@ if settings.DEBUG:
         ),
         path("500/", default_views.server_error),
     ]
-
-handler404 = "app.views.handler404"
-handler500 = "app.views.handler500"
-handler400 = "app.views.handler400"
diff --git a/static/css/font-face.css b/static/css/font-face.css
deleted file mode 100644
index a3b7cdb..0000000
--- a/static/css/font-face.css
+++ /dev/null
@@ -1,234 +0,0 @@
-/* poppins-100 - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: normal;
-  font-weight: 100;
-  src: url('../fonts/poppins/poppins-v5-latin-100.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Thin'), local('Poppins-Thin'),
-       url('../fonts/poppins/poppins-v5-latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-100.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-100.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-100.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-200 - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: normal;
-  font-weight: 200;
-  src: url('../fonts/poppins/poppins-v5-latin-200.eot'); /* IE9 Compat Modes */
-  src: local('Poppins ExtraLight'), local('Poppins-ExtraLight'),
-       url('../fonts/poppins/poppins-v5-latin-200.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-200.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-200.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-200.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-200.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-200italic - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: italic;
-  font-weight: 200;
-  src: url('../fonts/poppins/poppins-v5-latin-200italic.eot'); /* IE9 Compat Modes */
-  src: local('Poppins ExtraLight Italic'), local('Poppins-ExtraLightItalic'),
-       url('../fonts/poppins/poppins-v5-latin-200italic.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-200italic.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-200italic.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-200italic.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-200italic.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-100italic - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: italic;
-  font-weight: 100;
-  src: url('../fonts/poppins/poppins-v5-latin-100italic.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Thin Italic'), local('Poppins-ThinItalic'),
-       url('../fonts/poppins/poppins-v5-latin-100italic.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-100italic.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-100italic.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-100italic.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-100italic.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-300 - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: normal;
-  font-weight: 300;
-  src: url('../fonts/poppins/poppins-v5-latin-300.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Light'), local('Poppins-Light'),
-       url('../fonts/poppins/poppins-v5-latin-300.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-300.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-300.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-300.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-300.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-300italic - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: italic;
-  font-weight: 300;
-  src: url('../fonts/poppins/poppins-v5-latin-300italic.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Light Italic'), local('Poppins-LightItalic'),
-       url('../fonts/poppins/poppins-v5-latin-300italic.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-300italic.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-300italic.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-300italic.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-300italic.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-regular - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: normal;
-  font-weight: 400;
-  src: url('../fonts/poppins/poppins-v5-latin-regular.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Regular'), local('Poppins-Regular'),
-       url('../fonts/poppins/poppins-v5-latin-regular.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-regular.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-regular.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-regular.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-regular.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-italic - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: italic;
-  font-weight: 400;
-  src: url('../fonts/poppins/poppins-v5-latin-italic.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Italic'), local('Poppins-Italic'),
-       url('../fonts/poppins/poppins-v5-latin-italic.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-italic.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-italic.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-italic.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-italic.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-500 - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: normal;
-  font-weight: 500;
-  src: url('../fonts/poppins/poppins-v5-latin-500.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Medium'), local('Poppins-Medium'),
-       url('../fonts/poppins/poppins-v5-latin-500.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-500.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-500.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-500.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-500.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-500italic - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: italic;
-  font-weight: 500;
-  src: url('../fonts/poppins/poppins-v5-latin-500italic.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Medium Italic'), local('Poppins-MediumItalic'),
-       url('../fonts/poppins/poppins-v5-latin-500italic.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-500italic.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-500italic.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-500italic.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-500italic.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-600 - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: normal;
-  font-weight: 600;
-  src: url('../fonts/poppins/poppins-v5-latin-600.eot'); /* IE9 Compat Modes */
-  src: local('Poppins SemiBold'), local('Poppins-SemiBold'),
-       url('../fonts/poppins/poppins-v5-latin-600.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-600.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-600.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-600.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-600.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-600italic - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: italic;
-  font-weight: 600;
-  src: url('../fonts/poppins/poppins-v5-latin-600italic.eot'); /* IE9 Compat Modes */
-  src: local('Poppins SemiBold Italic'), local('Poppins-SemiBoldItalic'),
-       url('../fonts/poppins/poppins-v5-latin-600italic.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-600italic.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-600italic.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-600italic.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-600italic.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-700 - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: normal;
-  font-weight: 700;
-  src: url('../fonts/poppins/poppins-v5-latin-700.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Bold'), local('Poppins-Bold'),
-       url('../fonts/poppins/poppins-v5-latin-700.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-700.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-700.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-700.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-700.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-700italic - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: italic;
-  font-weight: 700;
-  src: url('../fonts/poppins/poppins-v5-latin-700italic.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Bold Italic'), local('Poppins-BoldItalic'),
-       url('../fonts/poppins/poppins-v5-latin-700italic.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-700italic.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-700italic.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-700italic.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-700italic.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-800 - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: normal;
-  font-weight: 800;
-  src: url('../fonts/poppins/poppins-v5-latin-800.eot'); /* IE9 Compat Modes */
-  src: local('Poppins ExtraBold'), local('Poppins-ExtraBold'),
-       url('../fonts/poppins/poppins-v5-latin-800.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-800.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-800.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-800.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-800.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-800italic - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: italic;
-  font-weight: 800;
-  src: url('../fonts/poppins/poppins-v5-latin-800italic.eot'); /* IE9 Compat Modes */
-  src: local('Poppins ExtraBold Italic'), local('Poppins-ExtraBoldItalic'),
-       url('../fonts/poppins/poppins-v5-latin-800italic.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-800italic.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-800italic.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-800italic.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-800italic.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-900 - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: normal;
-  font-weight: 900;
-  src: url('../fonts/poppins/poppins-v5-latin-900.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Black'), local('Poppins-Black'),
-       url('../fonts/poppins/poppins-v5-latin-900.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-900.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-900.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-900.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-900.svg#Poppins') format('svg'); /* Legacy iOS */
-}
-/* poppins-900italic - latin */
-@font-face {
-  font-family: 'Poppins';
-  font-style: italic;
-  font-weight: 900;
-  src: url('../fonts/poppins/poppins-v5-latin-900italic.eot'); /* IE9 Compat Modes */
-  src: local('Poppins Black Italic'), local('Poppins-BlackItalic'),
-       url('../fonts/poppins/poppins-v5-latin-900italic.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
-       url('../fonts/poppins/poppins-v5-latin-900italic.woff2') format('woff2'), /* Super Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-900italic.woff') format('woff'), /* Modern Browsers */
-       url('../fonts/poppins/poppins-v5-latin-900italic.ttf') format('truetype'), /* Safari, Android, iOS */
-       url('../fonts/poppins/poppins-v5-latin-900italic.svg#Poppins') format('svg'); /* Legacy iOS */
-}
diff --git a/templates/common/400.html b/templates/400.html
similarity index 72%
rename from templates/common/400.html
rename to templates/400.html
index b70ce22..dfcb0be 100644
--- a/templates/common/400.html
+++ b/templates/400.html
@@ -1,7 +1,7 @@
-{% extends 'common/_base.html' %}
+{% extends 'error_handler_base.html' %}
 
 {% block content %}
-<div class="text-center">
+<div class="text-center mt-5">
     <h1>Bad request</h1>
     <p>Please make sure the form is correctly filled.</p>
     <a href="/" class="link">&LeftArrow; Return to the app</a>
diff --git a/templates/common/403.html b/templates/403.html
similarity index 73%
rename from templates/common/403.html
rename to templates/403.html
index 4002522..e7087c7 100644
--- a/templates/common/403.html
+++ b/templates/403.html
@@ -1,7 +1,7 @@
-{% extends 'common/_base.html' %}
+{% extends 'error_handler_base.html' %}
 
 {% block content %}
-<div class="text-center">
+<div class="text-center mt-5">
     <h1>403, forbidden</h1>
     <p>You need the proper permission to make that request.</p>
     <a href="/" class="link">&LeftArrow; Return to the app</a>
diff --git a/templates/common/404.html b/templates/404.html
similarity index 73%
rename from templates/common/404.html
rename to templates/404.html
index f4c39c0..f724f19 100644
--- a/templates/common/404.html
+++ b/templates/404.html
@@ -1,7 +1,7 @@
-{% extends 'common/_base.html' %}
+{% extends 'error_handler_base.html' %}
 
 {% block content %}
-<div class="text-center">
+<div class="text-center mt-5">
     <h1>404</h1>
     <p>Looks like the page you're looking for is does not exist.</p>
     <a href="/" class="link">&LeftArrow; Return to the app</a>
diff --git a/templates/common/500.html b/templates/500.html
similarity index 70%
rename from templates/common/500.html
rename to templates/500.html
index ca49985..f7d2b28 100644
--- a/templates/common/500.html
+++ b/templates/500.html
@@ -1,7 +1,7 @@
-{% extends 'common/_base.html' %}
+{% extends 'error_handler_base.html' %}
 
 {% block content %}
-<div class="text-center">
+<div class="text-center mt-5">
     <h1>Server error</h1>
     <p>Please try again later.</p>
     <a href="/" class="link">&LeftArrow; Return to the app</a>
diff --git a/templates/accounts/lecturer_list.html b/templates/accounts/lecturer_list.html
index 36a5eef..25be0c2 100644
--- a/templates/accounts/lecturer_list.html
+++ b/templates/accounts/lecturer_list.html
@@ -77,9 +77,7 @@
                 
                 {% empty %}
                 <tr>
-                  <td></td>
-                  <td></td>
-                  <td>
+                  <td colspan="8">
                   <span class="text-danger">
                     No Lecturer(s).
                     {% if request.user.is_superuser %}
@@ -91,9 +89,6 @@
                     </a>
                   </span>
                 </td>
-                <td></td>
-                <td></td>
-                <td></td>
                 </tr>
 
             </tr>
diff --git a/templates/accounts/student_list.html b/templates/accounts/student_list.html
index b22f9a4..3417f2c 100644
--- a/templates/accounts/student_list.html
+++ b/templates/accounts/student_list.html
@@ -84,9 +84,7 @@
                 
                 {% empty %}
                 <tr>
-                  <td></td>
-                  <td></td>
-                  <td>
+                  <td colspan="6">
                   <span class="text-danger">
                     No Student.
                     {% if request.user.is_superuser %}
@@ -98,9 +96,6 @@
                     </a>
                   </span>
                 </td>
-                <td></td>
-                <td></td>
-                <td></td>
                 </tr>
 
             </tr>
diff --git a/templates/app/index.html b/templates/app/index.html
index 57598a4..230e3f6 100644
--- a/templates/app/index.html
+++ b/templates/app/index.html
@@ -53,8 +53,8 @@
 
     <div class="title-1">News &amp; Events</div>
 
-    <ul class="col-md-2 ml-auto d-flex">
-        <li class="mr-3">
+    <ul class="col-md-2 ms-auto d-flex">
+        <li class="me-3">
             <span class="color-indicator bg-primary"></span> News
         </li>
         <li>
diff --git a/templates/base.html b/templates/base.html
index 5675743..1cc447d 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -10,7 +10,6 @@
     <title>{% block title %}DjangoSMS{% endblock title %}</title>
 
     <link rel="shortcut icon" href="{% static 'img/favicon.png' %}" type="image/x-icon">
-    <!-- <link href="{% static 'css/font-face.css' %}" rel="stylesheet" media="all"> -->
 
     <link rel="stylesheet" type="text/css" href="{% static 'vendor/bootstrap-5.3.2/css/bootstrap.min.css' %}">
 
@@ -23,15 +22,22 @@
 </head>
 
 <body>
-    {% include 'aside.html' %}
+    {% block sidebar %}
+        {% include 'aside.html' %}
+    {% endblock %}
+
+    {% block maincontent %}
     <div id="main">
-        {% include 'navbar.html' %}
+        {% block topbar %}
+            {% include 'navbar.html' %}
+        {% endblock %}
 
         <div class="container-fluid" id="main-content">
             {% block content %}{% endblock content %}
         </div>
 
     </div>
+    {% endblock %}
 
     <script type="text/javascript" src="{% static 'vendor/jquery-3.7.1/jquery-3.7.1.min.js' %}"></script>
     <script type="text/javascript" src="{% static 'vendor/bootstrap-5.3.2/js/bootstrap.bundle.min.js' %}"></script>
diff --git a/templates/common/_base.html b/templates/common/_base.html
deleted file mode 100644
index 523a520..0000000
--- a/templates/common/_base.html
+++ /dev/null
@@ -1,31 +0,0 @@
-{% load static %}
-<!DOCTYPE html>
-<html lang="en">
-
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <meta http-equiv="X-UA-Compatible" content="ie=edge">
-
-    <title>{% block title %}Django Learning Management System{% endblock title %}</title>
-
-    <link rel="shortcut icon" href="{% static 'img/favicon.png' %}" type="image/x-icon">
-
-    <link rel="stylesheet" type="text/css" href="{% static 'css/bootstrap.min.css' %}">
-
-    <link rel="stylesheet" type="text/css" href="{% static 'css/all.css' %}">
-
-    <link rel="stylesheet" type="text/css" href="{% static 'css/style.css' %}">
-</head>
-
-<body>
-    <div id="main">
-
-        <div class="container-fluid" id="main-content">
-            {% block content %}{% endblock content %}
-        </div>
-
-    </div>
-</body>
-
-</html>
diff --git a/templates/course/program_single.html b/templates/course/program_single.html
index d2f3d2d..819125b 100644
--- a/templates/course/program_single.html
+++ b/templates/course/program_single.html
@@ -87,7 +87,7 @@
                     {% if request.user.is_superuser %}
                     <td>
                         <div class="dropdown">
-                            <button class="btn btn-sm" id="dropdownMenuButton" data-toggle="dropdown"
+                            <button class="btn btn-sm" type="button" data-bs-toggle="dropdown"
                                 aria-haspopup="true" aria-expanded="false">
                                 <i class="fas fa-ellipsis-v"></i>
                             </button>
diff --git a/templates/error_handler_base.html b/templates/error_handler_base.html
new file mode 100644
index 0000000..3e29c44
--- /dev/null
+++ b/templates/error_handler_base.html
@@ -0,0 +1,8 @@
+{% extends 'base.html' %}
+
+{% block sidebar %}{% endblock %}
+
+{% block maincontent %}
+{% block content %}
+{% endblock %}
+{% endblock %}
\ No newline at end of file