* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
    font-family: "Courier New", monospace;
  }
  
  html {
    font-size: 62.5%;
  }
  
  .container {
    width: 100%;
    height: 100vh;
    background-color: #262626;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .btn {
    position: absolute;
    width: 18rem;
    height: 18rem;
    background-color: #9b0e0e;
    border-radius: 50%;
    border: 0.2rem dotted #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  
  .btn span {
    position: relative;
    color: #fff;
    font-size: 1.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2rem;
  }
  
  .ripple {
    position: absolute;
    width: 0;
    height: 0;
    background-color: #e7be08;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: rippleAnim 0.5s forwards;
  }
  
  @keyframes rippleAnim {
    0% {
      width: 0;
      height: 0;
    }
    100% {
      width: 210%;
      height: 210%;
    }
  }