Ah gomen ne, I totally missed this question ^^;
I was away so I didn't really check my email..

Anyway, I change the font family & font size in the custom CSS, like this:

body {
margin: 0px;
padding: 0px;
background: #fbf2e7;
color: #53330b;
font-family: lucida sans unicode, arial unicode ms, tahoma, sans-serif;
font-size: 65%;
text-align: center;
}

It helps if you know a bit of HTML & CSS ^^
Good luck!