html,body{background:#87a5c8;height:100%;margin:0;overflow:hidden}canvas{width:100vw;height:100vh;display:block}.overlay{color:#fff;background:#0000008c;border-radius:4px;max-width:calc(100vw - 32px);padding:6px 8px;font:12px/1.4 ui-monospace,monospace;position:fixed;top:8px;left:8px}.overlay pre{white-space:pre-wrap;margin:0}.overlay button,.overlay select{font:inherit;margin:6px 6px 0 0}