#wrapper {
      overflow: hidden; 
      position: relative; 
    }
    
    .joerg-logo {
         z-index: 1000;
         position: relative;
     }

     .container-nav-vertical {
         z-index: 950;
         position: relative;
     }

     #container-content {
         z-index: 900;
         position: relative;
     }