body { background : #000000; margin: 0px; padding: 0px;}
body.foo { background : #000000; }
canvas { width: 100%; height: 100%; margin: 0px; padding: 0px; }
#d23 { position : absolute; color: #fff; font-family: arial; bottom:3%;right:3%;}
#toobad { display : none;}
.foo #toobad { display : block; color : #fff;}