Testseite

<style>

  .main-container {
      background: url(https://www.zeldachronicles.de/rpg/skins/Vector/rpg-images/paper_main.jpg?e9247) no-repeat center center;
      background-size: cover;
      padding: 20px;
      max-width: 1024px;
      margin: 0 auto;
      position: relative;
  }

  .main-top-liner {
      background: url(https://www.zeldachronicles.de/rpg/skins/Vector/rpg-images/main_top-liner.png) no-repeat center top;
      height: 20px;
      width: 100%;
  }

  .main-top-edges {
      display: flex;
      justify-content: space-between;
  }

  .main-top-left-edge, .main-top-right-edge {
      width: 20px;
      height: 20px;
  }

  .main-top-left-edge {
      background: url(https://www.zeldachronicles.de/rpg/skins/Vector/rpg-images/main_top-left-edge.png) no-repeat left top;
  }

  .main-top-right-edge {
      background: url(https://www.zeldachronicles.de/rpg/skins/Vector/rpg-images/main_top-right-edge.png) no-repeat right top;
  }

  .main-content {
      padding: 20px;
      background: white;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
  }

  .main-bottom-edges {
      display: flex;
      justify-content: space-between;
  }

  .main-bottom-left-edge, .main-bottom-right-edge {
      width: 20px;
      height: 20px;
  }

  .main-bottom-left-edge {
      background: url(https://www.zeldachronicles.de/rpg/skins/Vector/rpg-images/main_bottom-left-edge.png) no-repeat left bottom;
  }

  .main-bottom-right-edge {
      background: url(https://www.zeldachronicles.de/rpg/skins/Vector/rpg-images/main_bottom-right-edge.png) no-repeat right bottom;
  }

</style>