Html / css не работает на мобильном устройстве

body {
  margin: 0;
}

embed {  position:absolute; top:0; right:0}

.navbar {
  overflow: hidden;
  background: #304352;
  /* fallback for old browsers */
  background: -webkit-linear-gradient(to left, #304352, #d7d2cc);
  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to left, #304352, #d7d2cc);
  /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
  position: fixed;
  top: 0;
  width: 100%;
}

.navbar a {
  float: left;
  display: block;
  color: black;
  text-align: center;
  padding: 6px 16px;
  text-decoration: none;
  font-size: 17px;
  font-family: monospace
}

.navbar a:hover {
  background: #ddd;
  color: black;
}

.main {
  padding: 16px;
  margin-top: 30px;
  height: 1500px;
  background: #304352;
  /* fallback for old browsers */
  background: -webkit-linear-gradient(to left, #304352, #d7d2cc);
  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to left, #304352, #d7d2cc);
  /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

@viewport {
  zoom: 1.0;
  width: device-width;
}

<div class = "navbar">
  <a><b>HampusM</b></a>
  <a href = "http://hampusm.github.io">Home</a>
  <a href = "repositories.html">Repositories</a>
  <a href = "contact.html">Contact</a>
</div>
<embed src = "switch.svg" width = "50" type = "image/svg+xml" />
<div class = "main">
  <center>
    <br>
    <h1>Home</h1>
    <br>
    <!-- this br is meant to not end with a > -->
    <br <div class = "btn-group">
    <a href = "https://github.com/Hampusm"><button type = "button" class = "btn btn-primary">Github</button></a>
    <a href = "https://discord.gg/6T8BukM"><button type = "button" class = "btn btn-primary">Discord</button></a>
    <a href = "https://twitter.com/hampusm03"><button type = "button" class = "btn btn-primary">Twitter</button></a>
</div>
</center>
</div>