label {
    display: inline-block;
    padding: 0.3em;
    border: 1px solid #CCC;
    background-color: #EEE;
    border-radius: 4px;
    cursor:pointer;
}

#img {
    display: none;
    visibility: hidden;
}

label:hover {
    background-color: #CCC;
}

input[type="checkbox"]:checked + #img {
    visibility: visible;
    display:block;
}