body {
  background-color: #121212;
  color: #eee;
  font-family: sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 1rem;
}
a { color: #90caf9; }
img { max-width: 100%; height: auto; }
ul {
  list-style: disc;
  padding-left: 1.5rem;
}
li { margin-bottom: 0.5em; }

.post-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 2em;
}

.post-nav a {
  color: #fff;
  background-color: #333;
  padding: 0.5em 1em;
  text-decoration: none;
  border-radius: 4px;
}

.post-nav a:hover {
  background-color: #444;
}