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

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

.container {
    text-align: center;
    padding: 20px;
    border-radius: 10px;
    background-color: #fff;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    width: 300px;
}

h1 {
    margin-bottom: 20px;
    color: #4CAF50;
}

.game-btn {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px;
    margin: 10px;
    cursor: pointer;
    border-radius: 5px;
    font-size: 16px;
    width: 200px;
}

.game-btn:hover {
    background-color: #45a049;
}

.game {
    display: none;
}

.tic-tac-toe-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.tic-tac-toe-btn {
    width: 60px;
    height: 60px;
    font-size: 24px;
    background-color: #ddd;
    border: 1px solid #bbb;
    cursor: pointer;
}

.memory-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.memory-card {
    width: 60px;
    height: 60px;
    background-color: #ccc;
    border: 1px solid #bbb;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
}

.memory-card.flipped {
    background-color: #4CAF50;
    color: white;
}