body {
  font-family: Helvetica, Arial, sans-serif;
  line-height: 1.5;
  margin: 0;
  padding: 0;
  color: #333;
}

.container {
  max-width: 800px;
  margin: auto;
  padding: 20px;
}

.section {
  padding: 20px 0;
}

a {
  text-decoration: none;
}

pre {
  border: 1px solid #ddd;
  box-shadow: 5px 5px 5px #eee;
  padding: 1em;
  overflow-x: auto;
}

code {
  background: #f9f9f9;
}

pre code {
  background: none;
}

header {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0 1em;
  background-color: #333;
  color: #fff;
  height: 30px;
}

header a {
  color: #fff;
  margin: 0 10px;
  font-size: 14px;
}

footer {
  text-align: center;
  padding: 10px 0;
  background-color: #333;
  color: #fff;
}

img {
  max-width: 100%;
  height: auto;
}

p {
  font-size: 15px;
}

figcaption {
  font-size: 12px;
  font-style: italic;
}

.pd {
  width: 6em;
  flex-shrink: 0;
  padding-bottom: .9em;
}

.par div {
  display: flex;
}

.np {
  display: flex;
  justify-content: center;
  gap: 10px;
}