body {
  font-family: Arial, sans-serif;
  max-width: 700px;
  margin: 30px auto;
  padding: 0 16px;
  background-color: #fafafa;
  color: #222;
}

h2 {
  color: #c62828;
  border-bottom: 2px solid #ddd;
}

.intro {
  line-height: 1.6;
  font-size: 18px;
}

#main-title {
  text-align: center;
  color: #111;
}

img {
  display: block;
  margin: 20px auto;
}