make title bold

Author: Ankit7Das

404.html

@@ -89,7 +89,7 @@
       <main class="mdl-layout__content">
         <!-- Custom 404 page -->
         <div class="nwoc-content" style="height:calc(100vh - 235px)">
-          <h3>Error: 404</h3>
+          <h3><b>Error: 404</b></h3>
           <p>Sorry, the page you are looking for does not exist. You can look for it on the <a href="/">homepage</a>.</p>
         </div>