.callbacks_container { /*margin-bottom: 50px;*/ position: relative; float: left; width: 100%; }
.callbacks { position: relative; list-style: none; overflow: hidden; width: 100%; padding: 0; margin: 0;}
.callbacks li { position: absolute; width: 100%; left: 0; top: 0; }
.callbacks img { display: block; position: relative; z-index: 1; height: auto; width: 50%;  border: 0; }
.callbacks .caption { display: block; position: absolute; z-index: 2; font-size: 20px; text-shadow: none; color: #fff; background: #000; background: rgba(0,0,0, .8); left: 0; right: 0; bottom: 0; padding: 10px 20px; margin: 0; max-width: none; }
.callbacks_nav {position: absolute; -webkit-tap-highlight-color: rgba(0,0,0,0); top: 50%; left: 0; opacity: 1; z-index: 3;  text-indent: -9999px; overflow: hidden;  text-decoration: none; height: 200px; width: 26px; background: transparent url("../img/slide-fb-arrows.png") no-repeat left top; margin-top: -100px; }
.callbacks_nav:active {  opacity: 1.0; }
.callbacks_nav.next { left: auto; background-position: right top; right: 0; }

@media only screen and (max-width:720px){
    .callbacks img { width: 100%; }
}