Remove outdated vendor prefixes from CSS

Co-authored-by: DRSDavidSoft <[email protected]>

Author: Copilot

css/main.css

@@ -29,8 +29,6 @@ body > div.container, body > div.container-fluid {
     margin: 2em auto;
     padding: 0 0 2em 0;
     background-color: #fff;
-    -webkit-box-shadow: 0 0 8px 3px #eee;
-    -moz-box-shadow: 0 0 8px 3px #eee;
     box-shadow: 0 0 8px 3px #eee;
 }
 main > section {
@@ -97,10 +95,6 @@ h4 {
     font-size: 1.1em;
     outline: none;
     text-decoration: none;
-    -webkit-transition: background-color 0.3s;
-    -moz-transition: background-color 0.3s;
-    -ms-transition: background-color 0.3s;
-    -o-transition: background-color 0.3s;
     transition: background-color 0.3s;
 }
 .btn:active:focus {
@@ -246,8 +240,6 @@ ul ol {
 
     body > div.container, body > div.container-fluid {
         background-color: #2a2a2a;
-        -webkit-box-shadow: 0 0 8px 3px #000;
-        -moz-box-shadow: 0 0 8px 3px #000;
         box-shadow: 0 0 8px 3px #000;
     }