body {
  margin:0;
  padding:0;
  background: #00003c;  
}

.main.guide.content {
  max-width: 400px;
  color: #ffcf74;
}

.content>h1, .content>h2, .content>h3, .content>h4 {
  background: dodgerblue;
  --rm-color: white;
  border-radius: 8px;
  padding: 4px;
}