footer {
  padding: 0.5 em;
  font-size: larger;
}

main {
  padding: 0.5em;
}

nav {
  padding: 0.5em;
}

/********************* Erwartete CSS-Elemente ***************/

header, footer {
  border: 0.1em solid black;
  background-color: lightgray;
  text-align: center;
}

main {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
}

nav {
  border: 0.1em solid black;
}

nav a {
  display: block;
}

label {
  width: 4em;
  display:inline-block;
}

@media only screen and (max-width: 800px) {
  main {
    flex-direction: column;
  }
  nav a {
    display: inline-block;
  }
}