<form method="get" class="searchform" role="search" action="<?php echo esc_url(home_url('/')); ?>">
    <fieldset>
    	<input name="s" type="text" id="sc" placeholder="<?php _e( 'Buscar Expositores', 'thevoux' ); ?>" class="small-12">
    </fieldset>
</form>