to change the font size css

to change the font size to 11 is this the page to edit? if so
which ones do i edit?

tr{
font-family:Arial, Helvetica, sans-serif;
}
td{
font-family:Arial, Helvetica, sans-serif;
padding:1px 1px 1px 1px;
font-size:12px;
}
th{
font-family:Arial, Helvetica, sans-serif;
font-size:12px;
text-align:left;
}
pre{
font-family:Arial, Helvetica, sans-serif;
font-size:12px;
}

.smallText{
font-family:Arial, Helvetica, sans-serif;
font-size:12px;
}
.pageHeader{
font-family:Arial, Helvetica, sans-serif;
font-size:18px;
font-weight:bold;
}
.tableBorder{
border:1px solid #000000;
}
.tableBorder_noLeft{
border-right:1px solid #000000;
border-top:1px solid #000000;
border-bottom:1px solid #000000;
}
.tableBorder_topBottom{
border-top:1px solid #000000;
border-bottom:1px solid #000000;
}

.tableBorder_dbl_rtb{
border-right:2px double #000000;
border-top:2px double #000000;
border-bottom:2px double #000000;
}
.tableBorder_dbl_tb{
border-top:2px double #000000;
border-bottom:2px double #000000;
}

.answersInFrameText{
font-size:10px;
}
.answerText{
padding:1px 1px 1px 1px;
}