input[type=checkbox].css-checkbox {
    position:relative;
    z-index:-1000;
    overflow: hidden;
    clip: rect(0 0 0 0);
    height:1px;
    width:1px;
    margin:-1px;
    padding:0;
    border:0;
}

input[type=checkbox].css-checkbox + label.css-label, input[type=checkbox].css-checkbox + label.css-label.clr {
    padding-left:35px;
    height:22px; 
    display:inline-block;
    line-height:1.3em;
    background-repeat:no-repeat;
    background-position: 0 0;
    font-size:18px;
    vertical-align:middle;
    cursor:pointer;
    font-weight: 400;
}

input[type=checkbox].css-checkbox:checked + label.css-label, input[type=checkbox].css-checkbox + label.css-label.chk {
    background-position: 0 -22px;
}

label.css-label {
    background-image:url(http://app.salesman.org/check-list-toggle.png);
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}