source: flixita/1.0.74/searchform.php

<?php
/**
 * The template for displaying search form.
 */
?>
<form role="search" method="get" class="search-form" action="<?php echo esc_url( home_url( '/' ) ); ?>">
        <label>
                <span class="screen-reader-text"><?php esc_html_e( 'Search for:', 'flixita' ); ?></span>
                <input type="search" class="search-field" placeholder="<?php esc_attr_e( 'Search', 'flixita' ); ?>" value="" name="s">
        </label>
        <button type="submit" class="search-submit" value="<?php esc_attr_e( 'Search', 'flixita' ); ?>"><i class="fa fa-search"></i></button>
</form>