* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #f4f4f9;
}

.container {
  text-align: center;
}

h1 {
  margin-bottom: 20px;
}

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

.cell {
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  background-color: #fff;
  border: 2px solid #333;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.cell:hover {
  background-color: #f0f0f0;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  margin-top: 10px;
}

#message {
  margin-top: 20px;
  font-size: 18px;
  font-weight: bold;
}