#menu {
  background: url(/Bilder/Layout/menu.png);
  position: absolute;
  left: 10px;
  top: 10px;
  width: 50px;
  height: 50px;
  border-radius: 10px;
  border: 1px solid black;
  z-index: 10;
}

#menu * {
  display: none;
}

#menu UL {
  margin: 0px;
}

#menu:hover {
  background: #ac9;
  color: black;
  border: 1px solid black;
  height: initial;
  display: block;
  width: 300px;
  border-radius: 0px;
}

#menu:hover * {
  display: initial;
}

#menu:hover h2 {
  display: none;
}

#menu:hover ul {
  box-shadow: 5px 5px 10px #000;
  display: block;
}

#menu:hover li {
  display: block;
  margin: 0px;
  border-top: 1px solid black;
}

#menu:hover li a {
  display: block;
  padding: 15px;
  text-decoration: none;
  color: black;
  font-weight: bold;
}

#menu:hover li:first-child {
  border: none;
}

#menu:hover li:hover a {
  background: #dfc;
}

#menu:hover li li {
  display: none;
}

#menu:hover li:hover ul {
  margin-left: 300px;
  position: absolute;
  border: 1px solid black;
  margin-top: calc(-32px - 2ex);
  box-shadow: 5px 5px 10px #000;
}

#menu:hover li:hover li {
  display: block;
  width: 300px;
}

#menu:hover li:hover li a {
  background: #ac9;
}

#menu:hover li:hover li a:hover {
  background: #dfc;
}

/******************************************************************/

@media screen and (max-width: 630px) {

  #menu:hover li:hover ul {
    margin-left: 20px;
    position: initial;
    border: 1px solid black;
    margin-top: 0px;
  }

  #menu:hover li:hover {
    background: #dfc;
  }

  #menu:hover li:hover ul li {
    border-right: 1px solid black;
  }
}