Take some time to reflect on what you have learned about creating colors in Processing.
Commands:
background (r, g, b); // sets the color of the canvas
You must use these commands BEFORE the shape you want to outline or fill.
stroke (r, g, b); // sets the outline color of the shape
fill (r, g, b); // sets the fill color of the shape
In General:
r :: amount of red, from 0 (none) to 255 (maximum)
g :: amount of green, from 0 (none) to 255 (maximum)
b :: amount of blue, from 0 (none) to 255 (maximum)
Example code:
size(500, 400); // sets the width and height of the canvas
background(127); // sets the color of the canvas
// one number between 0-255 is gray-scale
stroke(203, 46, 70); // sets the outline color of the shape (LH maroon)
fill(254, 219, 0); // sets the fill color of the shape (LH yellow)
ellipse(250, 200, 100, 150); // draws an ellipse centered at (250,200)
// with a width of 100 and height of 150