video {
    width: 50%;
    background: #000;
    border-radius: 8px;
  }
  #mic-meter {
    height: 20px;
    background: #444;
    border-radius: 4px;
    overflow: hidden;
    margin-top: 0.3rem;
  }
  #mic-level {
    height: 100%;
    width: 0%;
    background: #4caf50;
    transition: width 0.1s ease-out;
  }
  .error {
    color: #f55;
  }