a:link {
      text-decoration:none;
}
A  { text-decoration: none; }
H1 { color: black; font-family: Arial; font-size: 12pt; font-weight: bold }
H2 { color: black; font-family: Arial; font-size: 12pt; font-weight: bold }
P  { color: black; font-family: Arial; font-size: 12pt }
html, body {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
font-family: Arial;
font-size: 12pt
}

#hintergrund {
width: 100%;
position: relative;
z-index: 1;
}

#content {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 2;
overflow: auto;
}
.menu {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  padding: 10px 20px;
}

.hamburger {
  cursor: pointer;
}

.hamburger span {
  display: block;
  height: 4px;
  width: 20px;
  background-color: black;
  margin: 5px;
}

.nav-links {
  display: none;
  list-style: none;
}

.nav-links li {
  margin: 0 20px;
}

.nav-links.open {
  display: flex;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: block;
  }
}