body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #ffffff;
  color: #000000;
}

header {
  background: #000;
  color: #fff;
  padding: 1rem;
  text-align: center;
}

nav {
  background: #222;
  padding: 0.5rem;
  text-align: center;
}

nav span {
  display: inline-block;
  margin: 0 1rem;
  color: #fff;
  font-weight: bold;
  cursor: default; /* sieht aus wie Link, aber klickt nicht */
}

main {
  display: flex;
  margin: 2rem;
}

article {
  flex: 3;
  padding: 1rem;
}

aside {
  flex: 1;
  background: #f4f4f4;
  padding: 1rem;
  border-left: 2px solid #000;
}

footer {
  background: #000;
  color: #fff;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}

.product {
  border: 2px solid #000;
  padding: 1rem;
  margin-bottom: 1rem;
  text-align: center;
}

.product h2 {
  margin: 0.5rem 0;
}