body {
  margin: 0;
  padding: 0;
  background-color: #0e0e0e;
  color: #fff;
  font-family: Arial, sans-serif;
}
#app {
  padding: 20px;
  text-align: center;
}
nav {
  margin: 20px 0;
}
button {
  background-color: #f5c847;
  color: #000;
  font-weight: bold;
  border: none;
  padding: 10px 15px;
  margin: 0 5px;
  border-radius: 5px;
  cursor: pointer;
}
button:hover {
  background-color: #ffe680;
}
.game-section {
  display: none;
  margin-top: 30px;
}