body {
  background-color: white;
  color: white;
  font-family: Verdana;
   height: 100vh;
    background-image: url("hintergrundhandy.jpg"); 
    background-size: cover;
    background-position: center;
    background-attachment: fixed; 
  }
  
 body {
  position: relative; /* Referenz für absolute Positionierung */
  margin: 0;
}

 .chatbox {
  position: absolute;
  top: 50%;
  left: 40%;
}