Did you delete the existing code?
PHP Code:
body {
background:url(images/bg-body.png) repeat-x top center #E8F7F9;
font-family:"Trebuchet MS" Arial, Helvetica, sans-serif;
font-size:62.5%; /* Sets default font size to 10px */
color:#222222;
}
to
PHP Code:
body {
background:url(images/bg-body.png) repeat-x top center #E8F7F9;
font-family:Comic Sans MS, sans-serif;
font-size:62.5%; /* Sets default font size to 10px */
color:#222222;
}