update cases image pack style

site/static/style.css

@@ -1321,13 +1321,11 @@ a.entry-link:hover .anticon-smile {
 
 .preview-image-boxes.pack img {
   padding: 0;
-  border-bottom: 1px solid #ddd;
-  box-shadow: 0 2px 0 0 #fff, 0 3px 0 0 #ddd, 0 5px 0 0 #fff,  0 6px 0 0 #ddd;
+  box-shadow: 0 1px 0 0 #ddd, 0 3px 0 0 #fff, 0 4px 0 0 #ddd, 0 6px 0 0 #fff,  0 7px 0 0 #ddd;
 }
 
 .preview-image-box img:hover {
   box-shadow: 1px 1px 6px rgba(0, 0, 0, 0.3);
-  border-bottom-width: 0;
 }
 
 .outside-link:after {