CSS_Loader/loader.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <link rel="stylesheet" href="loader.css" />
  </head>
  <body>
    <div class="loader">
      <div class="duo duo1">
        <div class="dot dot1 dot-a"></div>
        <div class="dot dot1 dot-b"></div>
      </div>
      <div class="duo duo2">
        <div class="dot dot2 dot-a"></div>
        <div class="dot dot2 dot-b"></div>
      </div>
      <div class="duo duo3">
        <div class="dot dot3 dot-a"></div>
        <div class="dot dot3 dot-b"></div>
      </div>
      <div class="duo duo4">
        <div class="dot dot4 dot-a"></div>
        <div class="dot dot4 dot-b"></div>
      </div>
      <div class="duo duo5">
        <div class="dot dot5 dot-a"></div>
        <div class="dot dot5 dot-b"></div>
      </div>
    </div>
  </body>
</html>