.container {
    max-width: 980px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: auto;
}


@media (min-width: 768px) {
  .container {
    display: grid;
    grid-template-columns: 1fr 280px;
    grid-template-rows: 1fr auto;
  }
}

header {
  grid-column: span 2;
  padding: 30px;
  text-align: center;
}

main {
  flex: 1;
  padding: 20px;
}

aside {
  padding: 20px;
}

footer {
  grid-column: span 2;
  padding: 30px;
  text-align: center;
}

h1 {
  margin-bottom: 1em;
  font-weight: bold;
}