Habitación de noche :D
<!DOCTYPE html>
<html lang="es">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Canvas / PT 1</title>
</head>
<body>
<canvas width="600" height="400"> </canvas>
<script>
var screen = document.querySelector("canvas");
var brush = screen.getContext("2d");
brush.fillStyle = "#243333";
brush.fillRect(0,0,800,600);
brush.fillStyle = "#243333";
brush.fillRect(400,0,200,400);
brush.fillStyle = "black";
brush.beginPath();
brush.moveTo(300, 200);
brush.lineTo(0, 400);
brush.lineTo(600, 400);
brush.lineTo(0, 0);
brush.lineTo(600, 0);
brush.fill();
brush.fillStyle = "#1a2121";
brush.fillRect(200,133.33,200,133.33);
brush.fillStyle = "DarkSlateGrey";
brush.fillRect(220, 155, 50, 80);
brush.fillRect(220, 300, 50, 100);
brush.beginPath();
brush.fillStyle = "DarkSlateGrey";
brush.moveTo(170, 400);
brush.lineTo(220, 300);
brush.lineTo(300, 600);
brush.fill();
</script>
</body>
</html>