I will describe it in more detail.
I used this CSS to highlight the promotional price area and the original price area.
https://drive.google.com/file/d/1_RrUIISSBX7ywOVfmXu_dKc-2pgmxM0f/view?usp=sharing
But when entering the CSS, the promotion area changes according to my wishes, but the original price area of the products without promotion does not change.
You can see the arrow direction in the image below. I want the CSS to be able to change their colors
https://drive.google.com/file/d/1-zO7EiHsxgl8z7VrTzLWb8paRxx21IWv/view?usp=sharing