Added a blue theme as well. These themes are based on themes found here: https://bootswatch.com

application/views/user/add.php

@@ -113,6 +113,7 @@
             <select class="custom-select" id="user_stylesheet" name="user_stylesheet" required>
                 <option value='bootstrap.min.css' selected="selected">Standard theme</option>
                 <option value='bootstrap-dark.css'>Dark theme</option>
+                <option value='bootstrap-blue.css'>Blue theme</option>
             </select>
         </div>
 

application/views/user/edit.php

@@ -93,6 +93,7 @@
                         <select class="custom-select" id="user_stylesheet" name="user_stylesheet" required>
                             <option value='bootstrap.min.css' <?php if($user_stylesheet == "bootstrap.min.css") { echo "selected=\"selected\""; } ?>>Standard theme</option>
                             <option value='bootstrap-dark.css' <?php if($user_stylesheet == "bootstrap-dark.css") { echo "selected=\"selected\""; } ?>>Dark theme</option>
+                            <option value='bootstrap-blue.css' <?php if($user_stylesheet == "bootstrap-blue.css") { echo "selected=\"selected\""; } ?>>Blue theme</option>
                         </select>
                     </div>
                 </div>