body {
  font-family: sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: #fdfdfd;
}

header {
  background: #20232a;
  color: #fff;
  padding: 1em;
}

header a {
  color: #fff;
  text-decoration: none;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 1em;
}

nav ul li {
  margin: 0;
}

main {
  padding: 2em;
}

footer {
  background: #eee;
  text-align: center;
  padding: 1em;
  font-size: 0.9em;
  margin-top: 3em;
}

.button {
  display: inline-block;
  background: #0066cc;
  color: white;
  padding: 0.5em 1em;
  text-decoration: none;
  border-radius: 5px;
}