Video Banner In Html (bootstrap Page) Incorrectly Laid Out

I am attempting to adapt code from this site: Video Header snippet This places a video header and it overrides my entire page and content with itself (the video header). I would li

Solution 1:

If I understand your question :) , I think setting the height and min-height to 200px for the header fix the issue like :

header {
  position: relative;
  background-color: black;
  height: 200px;
  min-height: 200px;
  width: 100%;
  overflow: hidden;
}

see below snippet :

header {
  position: relative;
  background-color: black;
  height: 200px;
  min-height: 200px;
  width: 100%;
  overflow: hidden;
}

header video {
  position: absolute;
  top: 50%;
  left: 50%;
  min-width: 100%;
  min-height: 100%;
  width: auto;
  height: auto;
  z-index: 0;
  -ms-transform: translateX(-50%) translateY(-50%);
  -moz-transform: translateX(-50%) translateY(-50%);
  -webkit-transform: translateX(-50%) translateY(-50%);
  transform: translateX(-50%) translateY(-50%);
}

header .container {
  position: relative;
  z-index: 2;
}

header .overlay {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background-color: black;
  opacity: 0.5;
  z-index: 1;
}

@media (pointer: coarse) and (hover: none) {
  header {
    background: url('https://source.unsplash.com/XT5OInaElMw/1600x900') black no-repeat center center scroll;
  }
  header video {
    display: none;
  }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.slim.min.js"></script>
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.bundle.min.js"></script>
<header>
  <div class="overlay"></div>
  <video playsinline="playsinline" autoplay="autoplay" muted="muted" loop="loop">
    <source src="https://storage.googleapis.com/coverr-main/mp4/Mt_Baker.mp4" type="video/mp4">
  </video>
  <div class="container h-100">
    <div class="d-flex h-100 text-center align-items-center">
      <div class="w-100 text-white">
        <h1 class="display-3">Video Header</h1>
        <p class="lead mb-0">With HTML5 Video and Bootstrap 4</p>
      </div>
    </div>
  </div>
</header>

<section class="my-5">
  <div class="container">
    <div class="row">
      <div class="col-md-8 mx-auto">
        <p>The HTML5 video element uses an mp4 video as a source. Change the source video to add in your own background! The header text is vertically centered using flex utilities that are build into Bootstrap 4.</p>
        <p>The overlay color can be changed by changing the <code>background-color</code> of the <code>.overlay</code> class in the CSS.</p>
        <p>Set the mobile fallback image in the CSS by changing the background image of the header element within the media query at the bottom of the CSS snippet.</p>
        <p class="mb-0">
          Created by <a href="https://startbootstrap.com">Start Bootstrap</a>
        </p>
      </div>
    </div>
  </div>
</section>

Solution 2:

Try deleting all the z-index you have in your CSS and then add z-index: -1; on the media query inside the header, like this:

  @media (pointer: coarse) and (hover: none) {
      header {
        background: url('https://source.unsplash.com/XT5OInaElMw/1600x900') black no-repeat center center scroll;
        z-index: -1;
      }
      header video {
        display: none;
      }
    }