Merge pull request #1521 from gurleennsidhuu/page

made a 404 page

Author: avsm

site/404.md

@@ -0,0 +1,9 @@
+<!-- ((! set title Docs !)) ((! set documentation !)) ((! set nobreadcrumb !)) -->
+
+<div class="center">
+    <div class="head">
+        <h1><b>404</b></h1>
+        <h5><b>Oops, page not found!</b> <br>The page doesn't exist or some other error occurred.</h5>
+        <a href="https://ocaml.org/" class="btn">Home</a>
+    </div>
+</div>

site/css/ocamlorg.css

@@ -549,6 +549,16 @@ ul.translations:after { content: "]"; }
     height: 0px;
   }
 }
+.center{
+display: table;
+text-align: center;
+width: 100%;
+height:53vh;
+}
+.head{
+display: table-cell;
+vertical-align:middle;
+}
 
 /* Footer
  ***********************************************************************/