body {
  font-family: sans-serif;
  background: #f8f9fa;
  margin: 0;
  padding: 20px;
}
.container {
  max-width: 800px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
}
h1 {
  color: #2c3e50;
}
section {
  margin-top: 30px;
}
button {
  padding: 6px 12px;
  margin-top: 5px;
}
input {
  padding: 6px;
  margin: 5px 0;
  display: block;
  width: 100%;
}