body {
  background-color: #f0f0f0;
  font-family: Verdana, sans-serif;
  font-size: 16px;
}

h1, .heading {
  text-align: center;
  font-size: 30px;
  color: navy;
  margin-top: 30px;
}

h2, .subheading {
  text-align: center;
  font-size: 20px;
  color: darkred;
}

.section, .content, .content-box, .ref-box {
  margin: 20px;
  padding: 20px;
  background-color: white;
  border: 2px solid #bbb;
}

ul, ol {
  margin-left: 25px;
}

.image-box, .auto-style1 {
  display: block;
  margin: 20px auto;
  border: 3px solid black;
  width: 400px;
  max-width: 100%;
}

.backlink, .link-box a {
  display: block;
  margin: 15px;
  font-weight: bold;
  text-decoration: none;
  color: darkblue;
}

.link-box a:hover {
  text-decoration: underline;
}

.highlight {
  font-weight: bold;
  color: darkgreen;
}

.title {
  text-align: center;
  color: navy;
  font-size: 32px;
  font-weight: bold;
}

.subtitle {
  text-align: center;
  color: darkred;
  font-size: 20px;
}

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