Each of the shapes is a combination of a triangle and a one-side rounded rectangle. If you want to draw a triangle, I would suggest you first create a square with borders of different colors and then reduce the square’s width to 0. Now you can remove the unwanted border using the border-color: transparent trick. The different border colors can then be converted to one single color for the complete triangle.
We can repeat the same with other shapes by changing the position and the rotation.
There were some slight borders visible in the difference section but the score is above 600.