.icon {
    text-indent: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-align: left;
    display: inline-block;
    vertical-align: middle;
    background-repeat: no-repeat;
    background-image: url(../images/icons.png);
    width: 20px;
    height: 20px;
    margin: 0 0 3px 0;
}