:root {
    --completion: 50%;
    --offset: 2vh;
  }
  body {
    display: grid;
    place-content: center;
    height: 100vh;
    background: #333;
  }
  .indicator {
    height: 20vh;
    width: 20vh;
    position: relative;
    border-radius: 50%;
    border: 4px double white;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
  }
  output {
    z-index: 1;
    font-family: system-ui;
    font-size: 10vh;
    color: #333;
  }
  .indicator::after {
    display: block;
    width: 40vh;
    height: 40vh;
    content: "";
    background-color: #0cbaea;
    border-radius: 15vh;
    position: absolute;
    left: 50%;
    top: calc(100% - var(--completion) + var(--offset));
    translate: -50% 0;
    animation: spin 5s linear infinite;
  }
  
  @keyframes spin {
    100% {
      rotate: 360deg;
    }
  }