ADDING BACKGROUND VIDEO

                      
To apply background video effect in HTML document we will use CSS in HTML Let us start:





Add CSS

/* video background */
#background-video {
height: 100vh;
width: 100vw;
object-fit: cover;
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
z-index: -1;
}

/* page content */
h1, h2 ,p {
color: white;
font-family: Trebuchet MS;
font-weight: bold;
text-align: center;
}

h1 {
font-size: 6rem;
margin-top: 30vh;
}


h2 { font-size: 3rem; }
@media (max-width: 750px) {
#background-video { display: none; }
body {
background: url("https://assets.codepen.io/6093409/river.jpg") no-repeat;
background-size: cover;
}
}





Add HTML:

<video id="background-video" autoplay loop muted poster="https://assets.codepen.io/6093409/river.jpg">
<source src="https://assets.codepen.io/6093409/river.mp4" type="video/mp4>
</video>


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