style.css

body {
  background-color: #f5f5f5;
  font-family: Arial, sans-serif;
}

h1 {
  text-align: center;
  margin-top: 30px;
  color: #008f58;
}

.dark-mode h1 {
  color: #fff;
}

#scoreboard {
  margin: 20px auto;
  border-collapse: collapse;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

#scoreboard th {
  background-color: #f9f9f9;
  padding: 10px;
  text-align: center;
  font-weight: bold;
}

#scoreboard td {
  padding: 10px;
  text-align: center;
}

#scoreboard td span {
  font-size: 24px;
}

#board {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  width: 320px;
  margin: 0 auto;
  margin-top: 50px;
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.cell {
  width: 100px;
  height: 100px;
  border: 2px solid #ddd;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
  background-color: #f9f9f9;
}

.cell:hover {
  background-color: #e3e3e3;
}

.cell.x {
  background-color: #2196f3; /* Blue to X */
  color: #fff; /* White to text mark */
}

.cell.o {
  background-color: #f44336; /* Red to O */
  color: #fff; /* White to text mark */
}

button {
  display: block;
  margin: 0 auto;
  margin-top: 20px;
  padding: 10px 20px;
  font-size: 1rem;
  background-color: #008f58;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #008f58;
}

.dark-mode {
  background-color: #333;
  color: #fff;
}

.dark-mode #scoreboard th {
  background-color: #555;
}

.dark-mode #scoreboard td {
  background-color: #555;
  color: #fff;
}

.dark-mode #scoreboard td span {
  color: #fff;
}

.dark-mode .cell {
  background-color: #555;
  border-color: #666;
}

.dark-mode .cell.x {
  background-color: #2196f3; /* Blue to X */
  color: #fff; /* White to text mark */
}

.dark-mode .cell.o {
  background-color: #f44336; /* Red to O */
  color: #fff; /* White to text mark */
}

.dark-mode .cell:hover {
  background-color: #777;
}

footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  text-align: center;
  background-color: #f5f5f5;
  padding: 10px 0;
  font-size: 14px;
  color: #333;
}

.dark-mode footer {
  background-color: #333;
  color: #fff;
}