<div class="as_search">
    <form action="<?php echo esc_url( home_url( '/' ) ); ?>" method="get" accept-charset="utf-8">
        <label for="" class="blog-search">
            <input type="search" name="s" value="" placeholder="<?php echo esc_attr(__( 'Blog Search','ascreen' ))?>">
            <input class="icon-search" type="submit" name="" value="">
        </label>
    </form>
</div>