#image-dropdown {
border:1px solid black; width:300px; height:50px; overflow:hidden;
-moz-transition: height 0.1s;
-webkit-transition: height 0.1s;
-ms-transition: height 0.1s;
-o-transition: height 0.1s;
transition: height 0.1s;
}
#image-dropdown:hover {
height:200px; overflow-y:scroll;
-moz-transition: height 0.5s;
-webkit-transition: height 0.5s;
-ms-transition: height 0.5s;
-o-transition: height 0.5s;
transition: height 0.5s;
}
#image-dropdown input {
position:absolute;top:0;left:0;opacity:0;
}
#image-dropdown label {
display:none; margin:2px; height:100%; opacity:0.2;
border-bottom-style: solid;
border-color: rgba(153, 153, 153, 0.78);
background:url("http://clipartix.com/wp-content/uploads/2016/04/Red-banner-clipart-picture.png") 50% 50% no-repeat;
background-size: contain;
background-position: center;