.vsp4em {height: 4em;min-height: 4em;max-height: 4em;}
.vsp2em {height: 2em;min-height: 2em;max-height: 2em;}
.hsp20percent {display: inline-block;width: 20%;min-width: 20%;max-width: 20%;}
.hsp15percent {display: inline-block;width: 15%;min-width: 15%;max-width: 15%;}