well i wanted to make a stickman shirt so it looks like u have a thin body on ur profile but i couldnt find the correct color for dark background in the site could someone help me?

Take a screenshot of the bh website, edit the shirt with the program you used, open the screenshot in a different window/tab and resize it to be smaller, then place it on the original shirt template, use a color picker tool, and then use the bucket to fill in the shirt.