body{
font-family:Arial;
text-align:center;
background:linear-gradient(45deg,#4facfe,#00f2fe);
color:white;
}

.board{
display:grid;
grid-template-columns:repeat(3,100px);
gap:5px;
justify-content:center;
margin-top:30px;
}

.cell{
width:100px;
height:100px;
background:white;
color:black;
font-size:40px;
display:flex;
align-items:center;
justify-content:center;
cursor:pointer;
}

button{
margin-top:20px;
padding:10px 20px;
font-size:16px;
}