This is your html code
<ul id="themeswitcher">
-
<select name="themeswitcher" onchange="location. + this.options[this.selectedIndex].value;">
<option value="Classical Bride" selected="selected">Classical Bride</option>
<option value="New York Bride">New York Bride</option>
</select>
You have to add a few lines at the end to your css (to re-write the default styles) with e.g.
#themeswitcher ul { ... }
#themeswitcher select { ... }
Your css contains a general style for select tag at the top of the file. If you want to kick off the li bullet, add e.g
#themeswitcher ul {
margin: 0 0 0 0;
padding: 0 0 0 0;
list-style: none;
}