span.checkbox{width:17px;height:17px;border:1px solid #000;background:none;display:inline-block;margin:1px 3px 1px 0}span.checkbox.active{background:url(check.png) 50% 50% no-repeat}@media screen and (max-width: 603px) and (min-width: 300px){span.checkbox{width:23px;height:23px;border:1px solid #000;background:none;display:inline-block;margin:8px 0}}