body {
  font-family: Arial, sans-serif;
  background: linear-gradient(45deg, #2196F3, #FFEB3B);
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

#container {
  text-align: center;
}

h1 {
  margin-bottom: 20px;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-gap: 5px;
  margin-bottom: 20px;
}

.cell {
  width: 100px;
  height: 100px;
  border: 1px solid #333;
  font-size: 3em;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

#turn-message {
  margin-top: 10px;
}

.result-screen {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  color: #fff;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.result-screen.show {
  display: flex;
}

.result-screen button {
  margin-top: 20px;
  padding: 10px 20px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}