body {
  font-family: Arial, sans-serif;
  background: #f4f6f8;
}

.container {
  width: 500px;
  margin: 50px auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
}

input, textarea, select, button {
  width: 100%;
  margin-bottom: 12px;
  padding: 10px;
  font-size: 14px;
}

button {
  background: black;
  color: white;
  border: none;
  cursor: pointer;
}

#preview {
  margin-top: 20px;
  border-radius: 6px;
}