body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background-color: #f0f0f0;
  padding: 20px;
}

h1 {
  text-align: center;
}

main {
  padding: 20px;
}

section {
  margin-bottom: 20px;
}

h2 {
  margin-top: 0;
}

a {
  text-decoration: none;
  color: black;
}

footer {
  background-color: #f0f0f0;
  padding: 20px;
}