body {
  background: radial-gradient(ellipse at top, #202020, #040407) fixed;
}

a:visited {
  color: #ddd;
}

.page {
  max-width: 60em;
  border-radius: 1em;
  margin: 1em auto;
  background: #5555;
}

header {
  background-image: url('../img/td3-hexdump.jpg');
  background-position: center;
  background-size: cover;
  height: 25em;
  display: flex;
  align-items: flex-end;
}

header h1 {
  padding: 1em;
  margin: 0 4em 1em 0;
  background: #333a;
  color: #fff;
}

section {
  padding: 1em;
}

section pre {
  background: #fff3;
  border: 0.1em solid #fff4;
  padding: 0.3em;
  font-family: 'Source Code Pro', monospace;
  font-size: 1em;
  overflow: auto;
}

section code {
  background: #fff3;
  padding: 0.3em;
  font-family: 'Source Code Pro', monospace;
  font-size: 1em;
}