input, select, textarea, progress, button {
    border: solid 1px black;
}

.ster:hover {
    width:10px;
    height:10px;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    padding-left: 10px;
    background: url(ster_geel.png) top left no-repeat;
}