style.css

body {
    font-family: 'Arial', sans-serif;
    text-align: center;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

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

.title {
    color: #333;
    font-size: 36px;
    margin-bottom: 20px;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-gap: 10px;
    margin: 20px auto; /* Center horizontally within the container */
    justify-content: center; /* Center horizontally within the container */
    align-items: center; /* Center vertically within the container */
}

.cell {
    width: 100px;
    height: 100px;
    font-size: 36px;
    text-align: center;
    border: none;
    cursor: pointer;
    background-color: #f4f4f4;
    color: #333;
    transition: background-color 0.3s, transform 0.2s;
    animation-duration: 0.5s;
    animation-name: none;
    border-radius: 5px;
    display: flex;
    justify-content: center;
    align-items: center; /* Center X and O boxes vertically */
}

.cell.winner {
    animation-name: winningAnimation;
    animation-iteration-count: infinite;
}

@keyframes winningAnimation {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

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

.message {
    font-size: 24px;
    margin: 20px 0;
    color: #333;
}

.scoreboard {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
}

.score {
    margin: 0 20px;
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

.reset-button {
    background-color: #e74c3c;
    color: #fff;
    padding: 10px 20px;
    font-size: 18px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.reset-button:hover {
    background-color: #c0392b;
}