Could someone please help me with the CSS on this mod, I haven't got a clue.

I am wanting to make the font size smaller on the tabs, I could swear I have changed every single number in this code but nothing makes the text size smaller. Thanks.
Code:
/* ***** tabs in header ***** */
body {
margin:0;
padding:0;
font: bold 11px/1.5em Verdana;
}
h2 {
font: bold 14px Verdana, Arial, Helvetica, sans-serif;
color: #000;
margin: 0px;
padding: 0px 0px 0px 15px;
}
img {
border: none;
}
#tabs1 {
float:left;
width:100%;
font-size:93%;
line-height:normal;
}
#tabs1 ul {
margin:0;
padding:0px 0px 0px 1px;
list-style:none;
}
#tabs1 li {
display:inline;
margin:0;
padding:0;
}
#tabs1 a {
float:left;
background:url("http://www.marineaquariumsa.com/images/tableft1.gif") no-repeat left top;
margin:0;
padding:0 1px 0 4px;
text-decoration:none;
}
#tabs1 a span {
float:left;
display:block;
background:url("http://www.marineaquariumsa.com/images/tabright1.gif") no-repeat right top;
padding:5px 15px 4px 6px;
color:#627EB7;
}
/* Commented Backslash Hack hides rule from IE5-Mac \*/
#tabs1 a span {float:none;}
/* End IE5-Mac hack */
#tabs a:hover span {
color:#627EB7;
}
#tabs1 a:hover {
background-position:0% -42px;
}
#tabs1 a:hover span {
color:#000000;
background-position:100% -42px;
}
#tabs1 #current a {
background-position:0% -42px;
}
#tabs1 #current a span {
background-position:100% -42px;
}