<div class="video-cont"><video id="myvideo" muted="" autoplay="" loop="" preload="true">
<source src="https://media.huanshoulv.com/livermore/issue/video2.mp4" type="video/mp4">
</video></div>
.video-cont {
position: absolute;
left: 0;
right: 0;
top: 0;
width: 100%;
height: 100%;
}
.video-cont video{
width: 100%;
height: 100%;
object-fit: cover;
}