@media only screen and (max-width: 600px) {
  h1 {
    font-size: 30px;
  }
  input {
    padding: 15px;
  }

  body::before {
    width: 300px;
    height: 300px;
    background-color: yellow;
    border-radius: 50%;
    top: -100px;
    left: -100px;
    box-shadow: 0 4px 16px -4px rgba(0, 0, 0, 1);
  }
  body::after {
    width: 300px;
    height: 300px;
    background-color: yellow;
    border-radius: 50%;
    bottom: 0px;
    right: 0;
    z-index: -2;
    box-shadow: 0 4px 16px -4px rgba(0, 0, 0, 1);
  }
  input {
    margin: 20px 10px;
  }
}