error.html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Uh Oh!</title>
  </head>
  <body>
    <video src="images/error.mp4" autoplay loop poster="posterimage.jpg"></video>
    <p>Whoops!</p>
    <p>It looks like you're not viewing this website on a mobile device. Development for tablet and desktop layouts is underway, but in the meantime, please view this website on a mobile device!</p>
  </body>
</html>
<style>
  @import url('https://fonts.googleapis.com/css?family=Ubuntu:300,400');
  *{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  body{
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    background-color: #333;
    font-family: 'Ubuntu', sans-serif;
  }

  video{
    width: 100vw;
    position: absolute;
    height: 100vh;
    z-index: 1;
  }

  p{
    background-color: rgba(255,255,255,0.5);
    z-index: 2;
  }

  p:nth-child(2){
    font-size: 150%;
    padding-left: 5vw;
    padding-right: 5vw;
    padding-top: 5vh;
    padding-bottom: 5vh;
    margin-bottom: 5vh;
  }

  p:nth-child(3){
    text-align: center;
    line-height: 3em;
    padding-left: 5vw;
    padding-right: 5vw;
    padding-top: 5vh;
    padding-bottom: 5vh;
  }
</style>