Change Title font in uploaded theme

Sure, it’s possible. Find the following code in your style.css theme and change the 25pt font size to what you want.

#title h1 {
color:#FFFFFF;
font-family:Verdana;
font-size:25pt;
margin:0;
padding:0;
}
#title a {
color:#FFFFFF;
font-size:25pt;
text-decoration:none;
}
#title a:hover {
color:#996699;
font-size:25pt;
}