body {
  font-family: "Fira Mono", monospace;
  margin: 20px;
  line-height: 1.6;
  font-size: 18px;
  color: black;
  background-color: white;
}

a {
  text-decoration: none;
}

a:hover, a:focus {
  text-decoration: none;
  background-color: lightblue;
}

a.section-link {
  color: gray;
}

section, header {
  border-collapse: collapse;
  border-left-style: solid;
  border-left-width: 2px;
  margin-bottom: 10px;
  margin-top: 10px;
  margin-left: 0;
  margin-right: 0;
  padding-left: 20px;
  padding-right: 10px;
}

ul, ol {
  padding-left: 20px;
}

section:target h1, section:target h2, section:target h3 {
  background-color: lavender;
}

@media (min-width: 640px) {
  .image-portrait {
    float: right;
  }
}