body * {
  margin: 0;
  padding: 0;
}

body {
  padding: 10px;
  font: 14px/1.2 Helvetica, Arial, sans-serif;
}

h1 {
  margin: 20px auto;
  text-align: center;
}

section {
  margin: 0 30px 30px 30px;
  padding: 20px;
  border: 1px solid #38B;
  border-radius: 20px;
  box-shadow: 2px 2px 2px silver;
}

section > h2 {
  margin: 0 0 20px;
  font-size: 1.4em;
}

section > h2::first-letter {
  font-size: 1.8em;
  color: #38B;
}

section > h2:first-child::first-letter {
  color: crimson;
}

section > h2 ul {
  margin: 15px 30px;
  font-size: 0.9em;
}

section > .example {
  margin: 20px 30px;
  font: italic 1.2em;
}

.example h3 {
  margin: 10px 0 5px;
}

.example pre {
  padding: 10px;
  border: 1px solid orange;
  border-radius: 5px;
  color: lime;
  background-color: #333;
}

/*
section > .solution-link {
  display: inline-block;
  padding: 10px;
  border: 1px solid #38B;
  border-radius: 5px;
  color: #38B;
  font-weight: bold;
  text-decoration: none;
  background-color: #EEF;
  box-shadow: 2px 2px 2px silver;
}

section > .solution-link:hover {
  background-color: #FFF;
  box-shadow: none;
}
*/