input[type="checkbox"] {
    display:none;
}

input[type="checkbox"] + label {
    color:#f2f2f2;
}

input[type="checkbox"] + label span {
    display:inline-block;
    width:26px;
    height:26px;
    margin:-2px 10px 0 0;
    vertical-align:middle;
    background:url(https://css.bahnflow.se/bilder/radio.png) left top no-repeat;
    cursor:pointer;
}

input[type="checkbox"]:checked + label span {
    background:url(https://css.bahnflow.se/bilder/radio.png) -28px top no-repeat;
}