JavaScript を使用せずに画像をオプションとして使用するドロップダウン選択を作成する方法

<div>

/* Style the overall dropdown box */
#image-dropdown {
    border: 1px solid black;
    width: 200px;
    height: 50px;
    overflow: hidden;
    transition: height 0.1s;  /* Hide when collapsed */
}
/* Style the dropdown when expanded */
#image-dropdown:hover {
    height: 200px;
    overflow-y: scroll;  /* Allow scrolling */
    transition: height 0.5s;
}
/* Hide the radio button visuals */
#image-dropdown input {
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
}
/* Style the dropdown options */
#image-dropdown label {
    display: none;
    margin: 2px;
    height: 46px;
    opacity: 0.2;
    background: url("http://www.google.com/images/srpr/logo3w.png") 50% 50%;
}
#image-dropdown:hover label {
    display: block;  /* Show all options when expanded */
}
/* Show the option related to the selected radio button */
#image-dropdown input:checked + label {
    opacity: 1 !important;
    display: block;
}