html/windows.html

<!DOCTYPE html>
<html>
<head>
  <style>
    .L {
      position: fixed;
      top: 0;
      left: 0;
      height: 100%;
      width: 100%;
      background: #000;
    }
    .d {
      position: absolute;
      top: calc(50% + 12px);
      left: calc(50% - 2px);
      transform-origin: 0 -12px;
      height: 4px;
      width: 4px;
      background: #fff;
      border-radius: 4px;
      animation: A 2s cubic-bezier(0, .7, 1, .3) calc(var(--d) * -.25s) infinite;
    }
    @keyframes A {
      to {
        transform: rotate(360deg);
      }
    }
  </style>
</head>
<body>
  <div class="L">
    <div style="--d:1" class="d"></div>
    <div style="--d:2" class="d"></div>
    <div style="--d:3" class="d"></div>
    <div style="--d:4" class="d"></div>
    <div style="--d:5" class="d"></div>
  </div>
</body>
</html>