body {
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  color: #222;
  background-color: #ffffff;
}

header, footer {
  background-color: #f2f2f2;
  padding: 20px;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
}

h1, h2, h3 {
  font-weight: normal;
  margin-top: 1.2em;
}

.subtitle {
  font-size: 1.1em;
  color: #555;
}

ul {
  padding-left: 20px;
}

a {
  color: #000;
  text-decoration: underline;
}

footer {
  margin-top: 40px;
  text-align: center;
}