.panel img {
  max-width: 640px;
  height: auto;
  }
  .panel {
    margin: 50px;
    justify-content: center;
    display: flex;
  }
  .pageName {
    text-align: center;
    font-size: 360%;
    }
    .readContents {
    text-align: center;
    }
    .page {
     background-color: gray;
     color: white;
    }