You can add items to the list / menu select code
<form action="" method="get"><select name="DropDownList">
<option>red</option>
</select></form>
like these:
style="background: black; color: red; text-decoration; none; border: 1px solid red;"
<form method="get" action="">
<select name="DropDownList" style="border: 2px solid #7ed01d; width: 115px; color: #ff9d33;">
<option>red</option>
<option>blue</option>
<option>green</option>
</select>
</form>