<form role="search" method="get" class="search-form" action="<?php echo esc_url(home_url( '/' )); ?>">
<div>
    <span class="screen-reader-text">Search for:</span>
        <input type="search" class="search-field" placeholder="<?php esc_html_e('Search','hikaru')?>" value="" name="s" title="Search for:" /> 
        <input type="button" class="search-submit" value=""/>
</div> 
</form>