html, body {
  margin: 0;
  padding: 0;
  background: #eaeaea;
  font-family: Arial, sans-serif;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: #f5f5f5;
  border-bottom: 1px solid #ccc;
}

.top-bar .title {
  font-weight: bold;
  font-size: 18px;
}

#flipBtn {
  font-size: 18px;
  padding: 6px 10px;
}

#game-container {
  width: 100%;
  height: calc(100vh - 50px);
  display: flex;
  justify-content: center;
  align-items: center;
}

#game {
  width: 100%;
  height: 100%;
}