body {
  font-family: Arial, sans-serif;
  background: #f9f9f9;
  margin: 20px;
}
.content {
  max-width: 50%;
  margin: 0 auto;
  background: #fff;
  padding: 20px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  line-height: 1.6;
}
h1 {
  text-align: center;
}
p { margin-bottom: 1em; }
ul { margin-bottom: 1em; }
footer {
  text-align: center;
  font-size: 0.8em;
  color: #666;
  margin-top: 2em;
  border-top: 1px solid #ccc;
  padding-top: 1em;
}