body {
  flex-direction: column;
  height: 78vh;
}
h1 {
  margin-left: 0px;
  width: auto;
}
.calculator {
  margin-bottom: -153px;
  margin-top: -51px;
}
@media (max-width: 632px) {
  /*430px*/
  h1 {
    font-size: 4rem;
  }
  .calculator {
    margin-left: 6px;
    margin-right: 6px;
    margin-bottom: -6px;
    margin-top: 0px;
  }
}
@media (max-width: 480px) {
  h1 {
      font-size: 2rem;
  }
  .calculator {
      width: 95%;
  }
  #display {
      font-size: 2rem;
      /* padding: 10px; */
  }
  button {
      height: 45px;
      font-size: 1.25rem;
  }
}

/* Extra small devices, e.g., Pixel 7a */
@media (max-width: 360px) {
  h1 {
      font-size: 1.8rem;
  }
  .calculator {
      width: 90%;
      /* padding: 5px; */
  }
  #display {
      font-size: 1.8rem;
      padding: 8px 0px;
  }
  button {
      height: 40px;
      font-size: 1rem;
  }
}