body {
  font-family: "Roboto";
}

header,
main,
footer {
  max-width: 640px;
  margin: 1em auto;
  background-color: rgb(148, 148, 246);
  padding: 2em;
  border: 1px solid black;
}

section {
  background-color: white;
  padding: 2em;
}

main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media screen and (min-width: 500px) {
  header {
    background-color: black;
    color: white;
  }

  main {
    grid-template-columns: repeat(2, 1fr);
  }
}