Added column class attribute

Column class attribute to use 2 columns on screensize, using this in navbar dropdown in corputils.html

stock/static/css/bootstrap.min.css

@@ -3401,6 +3401,22 @@ tbody.collapse.in {
     box-shadow: 0 6px 12px rgba(0, 0, 0, .175)
 }
 
+@media screen and (max-width: 991px){
+    .columns{
+        height: 200px;
+        overflow:scroll;
+    }
+}
+
+@media screen and (min-width: 992px){
+    .columns{
+        -moz-column-count:2; /* Firefox */
+        -webkit-column-count:2; /* Safari and Chrome */
+        column-count:2;
+        width: 500px;
+    }
+}
+
 .dropdown-menu.scrollable {
     overflow: auto;
     max-height: 450px;
@@ -6668,4 +6684,4 @@ button.close {
     .hidden-print {
         display: none !important
     }
-}
+}