Fix bug that will not let search form take 100% width on medium screen

static/css/elegant.less

@@ -45,6 +45,11 @@ h1, h2, h3, h4, h5, h6 {
         margin-left: 0;
         margin-right: 0;
     }
+    @media (min-width: @screen-sm-min) {
+        .form-control {
+            width: 100%;
+        }
+    }
 }
 
 .navbar-default {