@media (max-width: 1000px) {
  .book-background {
    margin: 0 auto;
    width: 100%;
  }

  .book-content {
    padding: 5.5em 2em;
  }
}

@media (max-width: 950px) {
  .form-flex {
    justify-content: center;
  }
  h2 {
    font-size: 3.5rem;
  }
}

@media (max-width: 800px) {
  .form-flex {
    min-width: 100%;
    padding: 1em;
    justify-content: center;
  }

  .form-control {
    width: 100%;
    padding-right: 0;
  }

  .book-content {
    padding: 8em 0.3em;
    height: auto;
  }

  .form-flex > h2 {
    text-align: center;
  }

  .button-msg {
    display: flex;
  }
}