body{

background:#111;
color:#00fff7;
font-family:Courier,monospace;
text-align:center;

}

#game{

width:320px;
margin:auto;

}

.grid{

display:grid;
grid-template-columns:repeat(4,80px);
gap:5px;

}

.tile{

width:80px;
height:80px;

display:flex;
align-items:center;
justify-content:center;

font-size:22px;

background:#222;
border:2px solid #00fff7;

}