#amazon-button {
  text-align: center;
}

#summary-and-cover {
  display: flex; justify-content: space-between; margin: 10vmin 0;

  & #summary { width: 40vw; }
  & #cover {
    display: block; order: 1; margin-left: 2vmax; width: 25vw; max-width: 350px;

    @media(max-width: 1680px) {
      max-width: 250px;
    }

    & img {
      display: block; width: 100%; margin: auto;
      border: 2px solid #eaeaea; border-radius: 10px;  overflow: hidden;
    }
  }

  @media (max-width: 750px) {
    flex-direction: column;
    & #cover { width: auto; margin: auto; }
    & #summary { width: auto; order: 2; margin-top: 5vh; }
  }
}

iframe { display: block; margin: auto; max-width: 100%; }