#gallery .tile .caption { 	position: absolute; 	display: block; 	left: 0; 	top: 0; 	width: 100%; 	height: 100%;  	opacity: 0;   -webkit-transition: opacity 0.3s;   -moz-transition: opacity 0.3s;   -o-transition: opacity 0.3s;   transition: opacity 0.3s;  	background: rgba(0,0,0,.4); }  #gallery .tile:hover .caption { 	opacity: 1; }  #gallery .tile:hover {     cursor: pointer;; }