Need help css for search form

Hi

i have search in my side bar . my input text alone too big how to make it small ?

i opened searchform.php i have follwing code in my searchform.php file i dont have any thing in css related to search

<form method="get" id="searchform" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<div>
	<input type="text" value="<?php echo wp_specialchars($s, 1); ?>" name="s" id="s" />
</div>
</form>