.selectanvelope input[type=radio].css-checkbox {
    position: absolute;
    z-index: -1000;
    left: -1000px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    height: 1px;
    width: 1px;
    margin: -1px;
    padding: 0;
    border: 0;
}
.selectanvelope input[type=radio].css-checkbox+label.css-label {
    padding-left: 35px;
    display: inline-block;
    background-repeat: no-repeat;
    background-position: 0 0;
    font-size: 16px;
    vertical-align: middle;
    cursor: pointer;
}
.selectanvelope input[type=radio].css-checkbox:checked+label.css-label {
    background-position: 0 -19px;
}
.selectanvelope label.css-label {
    background-image: url(http://csscheckbox.com/checkboxes/u/csscheckbox_f60067e68146be412873f96f1d2458cd.png);
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    background-size: 19px;
}