body {
  font-family: sans-serif;
  background: #f9f9f9;
  color: #333;
  padding: 20px;
}
.container {
  max-width: 800px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px #ccc;
}
.section {
  margin-top: 20px;
}
button {
  margin: 5px 0;
  padding: 10px;
  background: #1e40af;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}