javascript - Background image doesn't cover the whole height on mobile phones -


here deal. want set gif image background image whole screen before link opens. here how works. user clicks on link. jquery set delay opening of link. remove elements page. , assign gif image background. after new page loaded. works fine on pcs. strange reason doesn’t cover whole height on mobile screens. width. here html

<html lang="ru" class="back_image">

here css

html.back_image{   background: url("images/kingdom1.jpg") no-repeat center center fixed;   -webkit-background-size: cover;   -moz-background-size: cover;   -o-background-size: cover;   background-size: cover; }

here jquery code use:

<!-- delay registration link --> <script> function delay (url) {     settimeout( function() { window.location = url }, 4500 ); } </script> <!-- remove elemnts on clicking registration from--> <script> $(document).ready(function(){    $('#registration').click(function(){       $( '#remove_all' ).remove();    }); }); </script> <!-- animation web page after removing elements --> <script> $(document).ready(function(){    $('#registration').click(function(){     $('.back_image').css("background-image", "url(images/dragonfire2.gif)", );    }); }); </script>

.back_image class assigned html tag.

any help?


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