.files_expander{cursor:pointer;}

.files_expander .caret{
	display:inline-block;
}
.files_expander.expanded .caret{transform: rotate(0deg);}
ul.files li{
	transition: opacity 0.8s ease-in-out, max-height 1s ease-in-out;
	position: relative;
    zoom: 1;
    opacity: 0;
    height: auto;
    display: block;
	max-height:0;
	overflow:hidden;
}
ul.files.expanded li{
	overflow:visible;
	opacity: 1;
    max-height:999px;
}