#mein-bild {
    width: 200px;
    height: 200px;
    border: 4px solid red;
    background-color: #333;
    display: inline-block;
  }

  #mein-bild2 {
    width: 200px;
    height: 200px;
    background-color: darkgray;
    display: inline-block;
  }