style.css

* {
  max-width: 100%;
}

body {
  margin: 2rem auto;
  max-width: 50rem;
  line-height: 1.6;
  font-size: 1.125rem;
  background: #111;
  color: #eee;
  padding: 1rem;
  font-family: sans-serif;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

a {
  color: tan;
}

pre {
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

code {
  overflow-wrap: break-word;
}

input:not([type="checkbox"]):not([type="radio"]),
select,
textarea {
  display: block;
}