html,body{
margin:0;
padding:0;
height:100%;
overflow:hidden;
background:#000;
font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;
}

/* center container */
#wrap{
height:100%;
display:flex;
align-items:center;
justify-content:center;
position:relative;
}

/* glow behind the game */
#wrap::before{
content:"";
position:absolute;
width:640px;
height:820px;
background:radial-gradient(circle, rgba(120,210,255,.25), rgba(120,210,255,0) 70%);
filter:blur(40px);
z-index:0;
}

/* game canvas */
canvas#game{
background:transparent;
display:block;
border-radius:22px;
box-shadow:
0 30px 80px rgba(0,0,0,.75),
0 0 40px rgba(120,210,255,.25);
position:relative;
z-index:2;
}

/* score label */
#score{
position:fixed;
top:10px;
left:12px;
font:14px/1.3 system-ui,-apple-system,Segoe UI,Roboto,Arial;
color:rgba(255,255,255,.85);
text-shadow:0 2px 8px rgba(0,0,0,.45);
z-index:10;
pointer-events:none;
}