size(500,500);

background(250);

strokeWeight(8);

line(100, 0, 100, 500);

strokeWeight(8);

line(0, 400, 500, 400);

strokeWeight(8);

fill(0, 0, 200);

rectMode(CORNERS);

rect(-10, 500, 100, 400); 

strokeWeight(8);

fill(200, 0, 0);

rectMode(CORNERS);

rect(510,-10, 100, 400);

strokeWeight(15);

line(95, 200, 0, 200);

strokeWeight(8);

line(450, 400, 450, 500);

strokeWeight(7);

fill(230, 230, 0);

rectMode(CORNERS);

rect(600, 550, 450, 450);