kiloj757 on "Add search box in footer"

Hi I am trying to figure out how to make my search box have a background in it instead of being transparent.. I added

<form method="get" id="searchform" action="<?php bloginfo('home'); ?>/">
<div><input type="text" size="18" value="<?php echo wp_specialchars($s, 1); ?>" name="s" id="s" />
<input type="submit" id="searchsubmit" value="Search" class="btn" />
</div>
</form>

As mentioned in another topic but I can't seem to figure out how to style it to have a background color and text color.