.icon-16{
    display: inline-block;
    width: 16px;
    height: 16px;
    margin: 0;
    padding: 0;
}

.icon-24{
    display: inline-block;
    width: 24px;
    height: 24px;
    margin: 0;
    padding: 0;
}

.icon-32{
    display: inline-block;
    width: 32px;
    height: 32px;
    margin: 0;
    padding: 0;
}

.icon-64{
    display: inline-block;
    width: 64px;
    height: 64px;
    margin: 0;
    padding: 0;
}

.icon-16.button:hover{
    background-position: -16px 0;
}
.icon-24.button:hover{
    background-position: -24px 0;
}
.icon-32.button:hover{
    background-position: -32px 0;
}
.icon-64.button:hover{
    background-position: -64px 0;
}