<div class="kopa-search-box">
    <form action="<?php echo esc_url( home_url() ); ?>" method="get" class="search-form">
        <input type="text"  name="s" onBlur="if (this.value == '')
                                    this.value = this.defaultValue;" onFocus="if (this.value == this.defaultValue)
                                    this.value = '';" value="<?php echo get_search_query() ? esc_attr( get_search_query() ) : esc_attr__( 'Search this site', 'karo-light' ); ?>" >
        <span class="fa fa-search"></span>
        <button type="submit" class="fa fa-search"></button>
    </form>
</div>
<!-- search box -->