body {
  padding: 20px;
  background: #f8f9fa;
}
.page {
  max-width: 900px;
  margin: auto;
  background: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h2, h3 {
  margin-top: 0;
}
table td, table th {
  vertical-align: middle;
}