body {
  font-family: "Georgia", serif;
  background: #f4f1ec;
  text-align: center;
  padding: 40px;
}
.app {
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
button {
  padding: 10px 20px;
  font-size: 1.2em;
  cursor: pointer;
}
#card {
  margin-top: 20px;
  font-size: 1.5em;
  font-weight: bold;
}