body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #e3f2fd;
    color: #fff;
    flex-direction: column;
  }
  
  .container {
    width: 780px;
    border-radius: 20px;
    padding: 35px 40px;
    background-color: black;
  }
  
  .container header {
    color: #b2b2b2;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .container h2 {
    color: #fff;
    text-shadow:
      0 0 7px #fff,
      0 0 10px #fff,
      0 0 21px #fff,
      0 0 42px #ff6600,
      0 0 82px #ff6600,
      0 0 92px #ff6600,
      0 0 102px #ff6600,
      0 0 151px #ff6600;
      font-size: 2rem;
      cursor: pointer;
  }  
  
  header .column {
    display: flex;
    align-items: center;
  }
  
  header .column span {
    font-weight: 500;
    margin-right: 15px;
    font-size: 1.19rem;
  }
  
  .volume-slider input {
    accent-color: #fff;
  }
  
  .keys-check input {
    width: 60px;
    height: 30px;
    appearance: none;
    border-radius: 30px;
    background-color: #4b4b4b;
    cursor: pointer;
    position: relative;
  }
  
  .keys-check input::before {
    content: "";
    height: 20px;
    width: 20px;
    background-color: #8c8c8c;
    top: 50%;
    left: 0.3rem;
    border-radius: inherit;
    position: absolute;
    transform: translateY(-50%);
    transition: all 0.3s ease;
  }
  
  .keys-check input:checked::before {
    left: 2.1rem;
    background-color: #fff;
  }
  
  .piano-keys {
    display: flex;
    margin-top: 40px;
  }
  .piano-keys .key {
    cursor: pointer;
    user-select: none;
    list-style: none;
    color: #a2a2a2;
    position: relative;
    text-transform: uppercase;
  }
  
  .piano-keys .white {
    width: 70px;
    height: 230px;
    border: 1px solid black;
    border-radius: 2px 2px 8px 8px;
    background: linear-gradient(#fff 96%, #eee 4%);
  }
  
  .piano-keys .black {
    width: 44px;
    height: 140px;
    z-index: 2;
    margin: 0 -22px 0 -22px;
    border: 1px solid black;
    border-radius: 0 0 5px 5px;
    background: linear-gradient(#333, #000);
  }
  
  .piano-keys span {
    position: absolute;
    bottom: 20px;
    width: 100%;
    text-align: center;
    font-size: 1.13rem;
  }
  
  .piano-keys .white.active {
    box-shadow: inset -5px 5px 20px rgba(0, 0, 0, 0.2);
    background: linear-gradient(to bottom #fff 0%, #eee 100%);
  }
  
  .piano-keys .black.active {
    box-shadow: inset -5px 5px 10px rgba(255, 255, 255, 0.1);
    background: linear-gradient(to bottom #000, #434343);
  }
  
  .piano-keys .key.hide span {
    display: none;
  }

  footer {
    color: #000000;
    text-align-last: auto;
    padding: 10px 10px;
    margin-top: 10px;
    font-size: 1.6rem;
    background-color: #e3f2fd;
}

a{
    text-decoration: none;
    color: #000000;
}