respon iframe video on wordpress.php

<?php
/*
* Add to functions.php 
* Add div.videoWrapper to iframe
*/
function div_wrapper($content) {
    // match any iframes
    /*$pattern = '~<iframe.*</iframe>|<embed.*</embed>~'; // Add it if all iframe*/
    $pattern = '~<iframe.*src=".*(youtube.com|youtu.be).*</iframe>|<embed.*</embed>~'; //only iframe youtube
    preg_match_all($pattern, $content, $matches);

    foreach ($matches[0] as $match) {
        // wrap matched iframe with div
        $wrappedframe = '<div class="videoWrapper">' . $match . '</div>';

        //replace original iframe with new in content
        $content = str_replace($match, $wrappedframe, $content);
    }

    return $content;    
}
add_filter('the_content', 'div_wrapper');

video_respon.css

.videoWrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    padding-top: 25px;
    height: 0;
}
.videoWrapper iframe,
.videoWrapper object,
.videoWrapper embed{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}