.cell.x { color: #007bff; } .cell.o { color: #dc3545; } .message { font-size: 18px; margin-bottom: 20px; color: #fff; font-weight: bold; } button { padding: 10px 20px; font-size: 16px; cursor: pointer; background-color: #28a745; color: white; border: none; border-radius: 5px; transition: background-color 0.3s; } button:hover { background-color: #218838; }