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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>TikTok spinner</title>
  <style>
    :root {
      --base: 4px;
      --scale: 10;
      --length: 1.4s;
      --max-zoom: 1.2;
      --min-zoom: 0.6;
      --bg-color: black;
      --green: rgb(145, 244, 239);
      --red: rgb(219, 45, 82);
      --radius: calc(var(--base) * var(--scale));
      --margin: var(--base);
      --iradius: calc(var(--radius) - var(--margin));
      /* --ease: cubic-bezier(.05, 0, 1, 1); */
      --ease: linear;
    }
    
    body {
      padding: 0px;
      margin: 0px;
      background: var(--bg-color);
      height: 100vh;
      width: 100vw;
      /* center */
      display: flex;
      justify-content: center;
      align-items: center;
    }
    
    .loading-container {
      display: block;
      width: 200px;
      height: 100px;
    }
    
    .green {
      fill: var(--green);
      stroke-width: 0;
      r: var(--iradius);
      cx: calc(var(--radius));
      cy: calc(var(--radius) + var(--margin));
      animation: green var(--length) var(--ease) infinite;
    }
    
    .red {
      fill: var(--red);
      stroke-width: 0;
      r: var(--iradius);
      cx: calc(var(--radius) * 3);
      cy: calc(var(--radius) + var(--margin));
      animation: red var(--length) var(--ease) infinite;
    }
    
    .black {
      fill: black;
    }
    
    @keyframes green {
      25% {
        cx: calc(var(--radius) * 2);
        r: calc(var(--iradius) * var(--max-zoom));
      }
      
      50% {
        cx: calc(var(--radius) * 3);
        r: var(--iradius);
      }
      
      75% {
        cx: calc(var(--radius) * 2);
        r: calc(var(--iradius) * var(--min-zoom));
      }
      
      100% {
        cx: var(--radius);
        r: var(--iradius);
      }
    }
    
    @keyframes red {
      25% {
        cx: calc(var(--radius) * 2);
        r: calc(var(--radius) * var(--min-zoom));
      }
      
      50% {
        cx: calc(var(--radius) * 1);
        r: var(--iradius);
      }
      
      75% {
        cx: calc(var(--radius) * 2);
        r: calc(var(--iradius) * var(--max-zoom));
      }
      
      100% {
        cx: calc(var(--radius) * 3);
        r: var(--iradius);
      }
    }
  </style>
</head>
<body>
  <svg class="loading-container" 
       preserveAspectRatio="none"
       viewBox="0 0 200 100" 
       width="200" height="100">
    <defs>
      <mask id="redhole">
        <rect width="100%" height="100%" fill="white"/>
        <circle fill="black" class="red black"></circle>
      </mask>
      <mask id="greenhole">
        <rect width="100%" height="100%" fill="white"/>
        <circle fill="black" class="green black"></circle>
      </mask>
    </defs>
​
    <circle id="green" class="green" mask="url(#redhole)" ></circle>
    <circle id="red" class="red" mask="url(#greenhole)" ></circle>
  </svg>
</body>
</html>
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