fieldset {
  padding: 0;
  margin: 0;
  border: none;
}

@media (max-width: 48.5rem) {
  /*768px*/

  #registration-form {
    width: 27.5rem;
  }
}

@media (max-width: 30rem) {
  /*480px*/
  main h1 {
    margin-top: 10rem;
  }
  #registration-form {
    width: 80%;
  }
}