body {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.708);
  }
  .box {
    box-shadow:0px 0px 12px 1px rgb(0 0 0);
    background-color: black;
    width: 300px;
    height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    border: 15px solid black;
    padding: 30px;
    gap: 8px;
    border-radius: 10px;
  }
  .num {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    align-items: center;
    justify-content: center;
    gap: 1px;
    width: 95%;
    height: 500px;
  }
  .num button {
    background-color: black;
    color: rgb(255, 255, 255);
    border: 0px solid transparent;
    font-weight: bolder;
    height: 60px;
    width: 60px;
    font-size: 20px;
    border-radius: 70%;
  }
  .num button:nth-child(1),
  button:nth-child(2),
  button:nth-child(3),
  button:nth-child(4),
  button:nth-child(8),
  button:nth-child(12),
  button:nth-child(16),
  button:nth-child(19) {
    color: rgb(180, 103, 251);
  }
/*   .num button:hover {
    box-shadow: 0px 0px 3px 2px rgb(87, 86, 86);
  } */
/*   .num button:nth-child(1):hover,
  button:nth-child(2):hover,
  button:nth-child(3):hover,
  button:nth-child(4):hover,
  button:nth-child(8):hover,
  button:nth-child(12):hover,
  button:nth-child(16):hover,
  button:nth-child(19):hover {
    box-shadow: 0px 0px 3px 2px rgb(120, 8, 168);
  } */
  .num button:nth-last-child(1) {
    grid-column: 4/4;
  }
  .num button:nth-last-child(2) {
    grid-column: 3/3;
  }
  .num button:nth-last-child(3) {
    grid-column: 2/2;
  }
  #display {
    display: flex;
    justify-content: flex-end;
    align-items: flex-end;
    box-sizing: border-box;
    padding-bottom: 7px;
    font-size: 35px;
    border: 3px solid black;
    background-color: black;
    color: white;
    border-radius: 20px;
    width: 100%;
    height: 15%;
  }
  h1 {
    font-size: 65px;
    color: rgb(124, 183, 232);
    text-shadow: -3px 0px 5px blue;
    margin-top: 0;
  }