body {
  background-color: #646a70;
  font-family: sans-serif;
  font-size: 18px;
  max-width: 700px;
  margin: auto;
  padding: 2em;
}
h1 {
  color: #fced8c;
  font-size: 3em;
  text-align: center;
}
h2 {
  color: #fced8c;
  font-size: 2em;
}
h3 {
  color: #fced8c;
  font-size: 1.5em;
}
h4 {
  color: white;
  font-size: 0.7em;
  font-style: italic;
}
p {
  color: white;
}
a {
  color: #fced8c;
}
nav {
  background-color: #333;
  padding: 1em 0;
  margin-bottom: 2em;
  text-align: center;
}
nav a {
  color: #fced8c;
  text-decoration: none;
  margin: 0 1.5em;
  font-size: 1.2em;
  font-weight: bold;
  transition: color 0.2s;
}
nav a:hover {
  color: #fff;
}