div#used, div#tank, div#spent, div#co2, div#burn {border-top: 1px solid #000;padding:10px;}
table.mid {margin:auto;text-align:center}
p.mid {text-align:center;font-weight: bold; color: #006}
#co2 {text-align: center; vertical-align:middle; font-weight:bold;font-size: 1.5em}
select, input{width:130px}
.submit {display:none}
form {margin:0}