Wordpress: custom searchform

searchform.php

<form role="search" method="get" class="searchform" id="searchform" action="<?php echo home_url( '/' ); ?>">
    <div><label class="screen-reader-text" for="s"><?php _e('Search for:', 'bonestheme') ?></label>
        <input type="text" value="" placeholder="<?php _e( 'Search this site', 'bonestheme' )?>" name="s" id="s" />
        <input type="submit" id="searchsubmit" value="Submit" />
    </div>
</form>