html - media queries not having desired effect -


after using chrome developer tools try identify element manipulate in media queries, have not had luck in making banner responsive tablet , iphone size. url:

http://thursdaypools.mediafuel.net/innovations/fiberglass-pool-anchoring-system/

if resize it, see banner image not change size @ , have tried following:

@media screen , (max-width: 991px) {         #video-header {           height: 240px;         } }  /*@media (max-width: 980px) {   .banner {     height: 30vh; } }*/ 

the code thats commented out written before me , didn't work when got , see @ top effort after trying work had. neither #video-header nor .banner seem making difference.

the code banner one:

<?php get_header(); ?>     <div id="post-page" class="single-innovations-page content-area">   <?php get_template_part( 'template-parts/content', 'page-intro' ); ?> <!--dancortes added code below here--> <?php get_template_part('template-parts/content','page-banner'); ?>            <?php if( get_field( 'product_video' ) ): ?>     <div id="video-header" class="full-video">     <iframe id="player" type="text/html" width="100%" height="100%" src="<?php the_field( 'product_video' ); ?>?enablejsapi=1&amp;rel=0;" frameborder="0" allowfullscreen></iframe> <div onclick="closevideo()" class="close-video">                                   <p>close</p>  </div> </div> <?php endif; ?><!--product_video-->   <main class="subpage-content">    <div class="medium-wrapper">      <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>        <div class="innovation-information">          <?php the_field( 'innovation_information' ); ?>        </div>        <?php endwhile; else : ?>          <p><?php _e( 'sorry, no posts matched criteria.' ); ?></p>        <?php endif; ?>      </div> </div><!--page-top--> 

add background-size .banner

.banner {   background-size: contain; } 

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