a-css-file.css

body {
  font-family: "Helvetica Neue", "Helvetica", "Arial", sans-serif;
}

.container {
  max-width: 960px;
  margin: 0 auto;
}

h2 {
  font-size: 20px;
  border-bottom: 1px solid gray;
  padding-bottom: 10px;
}

.section-content {
  text-align: center;
}