.notes {
    margin: auto;
    width: 400px;
    position: fixed;
    top: 50%;
    left: 0;
    right: 0;
    text-align: center;
  }
  
  .note {
    font-size: 90px;
    font-weight: bold;
    position: relative;
    display: inline-block;
    padding-right: 30px;
    padding-left: 10px;
  }
  
  .note.active {
    color: #e74c3c;
  }
  
  .notes-list {
    overflow: auto;
    overflow: -moz-scrollbars-none;
    white-space: nowrap;
    -ms-overflow-style: none;
    -webkit-mask-image: -webkit-linear-gradient(
      left,
      rgba(255, 255, 255, 0),
      #fff,
      rgba(255, 255, 255, 0)
    );
  }
  
  .notes-list::-webkit-scrollbar {
    display: none;
  }
  
  .note {
    -webkit-tap-highlight-color: transparent;
  }
  
  .note span {
    position: absolute;
    right: 0.25em;
    font-size: 40%;
    font-weight: normal;
  }
  
  .note-sharp {
    top: 0.3em;
  }
  
  .note-octave {
    bottom: 0.3em;
  }
  
  .frequency {
    font-size: 32px;
  }
  
  .frequency span {
    font-size: 50%;
    margin-left: 0.25em;
  }
  
  .meter {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 50%;
    width: 400px;
    height: 33%;
    margin: 0 auto 5vh auto;
  }
  
  .meter-pointer {
    width: 2px;
    height: 100%;
    background: #2c3e50;
    transform: rotate(45deg);
    transform-origin: bottom;
    transition: transform 0.5s;
    position: absolute;
    right: 50%;
  }
  
  .meter-dot {
    width: 10px;
    height: 10px;
    background: #2c3e50;
    border-radius: 50%;
    position: absolute;
    bottom: -5px;
    right: 50%;
    margin-right: -4px;
  }
  
  .meter-scale {
    width: 1px;
    height: 100%;
    transform-origin: bottom;
    transition: transform 0.2s;
    box-sizing: border-box;
    border-top: 10px solid;
    position: absolute;
    right: 50%;
  }
  
  .meter-scale-strong {
    width: 2px;
    border-top-width: 20px;
  }
  
  .frequency-bars {
    position: fixed;
    bottom: 0;

  }
  
  @media (max-width: 768px) {
    .meter {
      width: 100%;
    }
  
    .notes {
      width: 100%;
    }
  }
  
  .swal-button {
    background: #2c3e50;
  }
  
  .a4 {
    position: absolute;
    top: 16px;
    left: 16px;
  }
  
  .a4 span {
    color: #e74c3c;
  }
  
  .auto {
    position: absolute;
    top: 16px;
    right: 16px;
  }