Inside the GridView tag, you can include special tags for customizing Pager styles :
<PagerSettings FirstPageText="First Page" LastPageText="Last Page" Mode="NumericFirstLast" Position="TopAndBottom" />
<PagerStyle BackColor="Yellow" ForeColor="Red" />
Here is an article that describes some options and shows how they will look. As you can see there, you can set the font directly in the tag PagerStyleor apply the CSS style as follows:
<style type="text/css">
.cssPager span { background-color:#4f6b72; font-size:18px;}
</style>
<PagerStyle CssClass="cssPager" />
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