body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-image: radial-gradient(red, yellow, green);

}

.container {
    text-align: center;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, auto);
    width: 306px;
    margin: 20px auto;
}

.cell {
    width: 100px;
    height: 100px;
    border: 2px solid #000;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 60px;
    cursor: pointer;
}

.cell:hover {
    background-color: #0de006a6;
}

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

button {
    font-size: 18px;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 13px;
}
button:hover{
    background-color: black;
    color: white;
    box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
}