body {
    margin: 0;
    padding: 0;
}

* {
    box-sizing: border-box;
}

#restartBtn {
    outline: none;
    margin-bottom: 20px;
    color: white;
    background-color: black;
    border-radius: 7px;
    font-size: 16px;
    padding: 10px 20px;
    border: 1px solid black;
    transition: 200ms transform;
}

#restartBtn:hover {
    cursor: pointer;
    transform: translateY(-4px);
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    flex-direction: column;
}

#gameBoard {
    height: 450px;
    width: 450px;
    display: flex;
    flex-wrap: wrap;
}

.cell {
    height: 150px;
    width: 150px;
    font-size: 70px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
}