* {
  box-sizing: border-box;
}
body {
  min-height: 100vh;
  font-family: serif;
  margin: 0;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}
h1 {
  text-align: center;
  font-size: clamp(1.5rem, 5vw, 2rem);
  margin: 1rem 0;
}
nav ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: flex;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  flex-wrap: wrap;
}
nav a {
  display: inline-block;
  padding: 0.5rem 0.25rem;
}
a {
  color: #0645ad;
  text-decoration: underline;
}
a:visited {
  color: #551a8b;
}
a:hover,
a:focus {
  color: #06c;
  text-decoration: underline;
}
a:active {
  color: #b22222;
}
main {
  text-align: center;
  max-width: 40ch;
  margin: 1rem auto;
  padding: 0 0.5rem;
}
footer {
  margin-top: auto;
  padding: 1rem;
  border-top: 1px solid gray;
  text-align: center;
}