body {color: black; background: white; font-family: sans-serif;}

.noprt,
.header,
.topchannel,
.navlinks,
.foot
{display: none;}

.gasmark {border: 1px solid black; color: black; background: white; font-weight: bold;}
.gasmark th {border-bottom: 1px solid black; padding: 5px 15px;}
.gasmark td {padding: 5px; text-align: center;}