css inner border transparent not working in my site,

Question

This inner border transparent only works for single page or jsfiddle, But not working in my website, what's wrong with my code? Anyone can help plz…

on jsfiddle working good.

DEMO

but my site photo does not show :(

Answer 1

I added z-index and position: relative to .item class like this:

.item {
   width: 21%;
   float: left;
   display: block;
   margin: 20px 2%;
   padding: 0px;
   cursor: pointer;

   /* Code added */
   position: relative;
   z-index: 0;
}