有人有更好的方法吗?我只是在学习如何使用CSS。

The image is the goal. I need to position each color correctly within the box. It must also be in the center of the browser. The result I got is exactly what the image is just with words. I'm really looking for a better way to do this because I kind of had to guess the left and bottom pixels. I also know it could have been done better and would really love to learn how.The image is the goal. I need to position each