amattu2/popover-sidebar.html

## popover-sidebar.html
<!DOCTYPE html>
<!-- Alec M., 2021 -->
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>Popover Sidebar</title>
    <style>
    html,
    body {
      margin: 0;
      padding: 0;
      font-family: sans-serif;
      position: relative;
    }

    body {
      background: #f2f2f2;
    }

    .popover {
      position: fixed;
      right: -530px;
      top: 0;
      bottom: 0;
      width: 530px;
      background: #fff;
      border-left: 1px solid rgba(0, 0, 0, 0.1);
      box-shadow: -5px 0 20px 0 rgba(66, 66, 66, 0.2);
      transition: all 0.3s ease-in;
    }

    .popover.active {
      right: 0;
    }

    .popover-title {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 90px;
      background: #3b3b3b;
      color: #fff;
      font-size: 21px;
      padding: 0 25px;
    }

    .popover-title .title {
      margin-right: auto;
    }

    .popover-title .times {
      font-size: 33px;
      cursor: pointer;
    }

    .content-preview {
      width: calc(100% - 100px);
      height: 250px;
      background: #f2f2f2;
      border: 1px solid rgba(0, 0, 0, 0.1);
      box-sizing: border-box;
      margin: 50px;
      display: flex;
      justify-content: center;
      align-items: center;
      user-select: none;
    }
    </style>
  </head>
  <body>
    <div class='popover active'>
      <div class='popover-title'>
        <span class='title'>Customer Map</span>
        <span class='times'>&times;</span>
      </div>
      <div class='popover-content'>
        <div class='content-preview'>
          ...
          </br>
          content here
          </br>
          ...
        </div>
      </div>
    </div>
    <script>
    setInterval(function() {
      document.querySelector('.popover').classList.add('active');
    }, 2000);
    </script>
  </body>
</html>