style.css

html {
    height: 100%;
    background: black;
  }
  
  body {
    height: inherit;
    margin: 0;
  }
  
  img {
    display: block;
    width: 100%;
  }
  
  .add-button {
    position: absolute;
    top: 1px;
    left: 1px;
  }
  
  @media (orientation: landscape) {
    img {
      height: 100%;
      object-fit: cover;
    }
  }