Stats Preview Card Component using basic HTML and CSS

The most difficult part of this project is the mix-blend-mode. What is the best practice to code the mix-blend-mode?

I still find difficulty to code the CSS without the design files. Is there any tools/ suggestion to help? How would a professional approach this problem in a real world?

I have been seeing the following CSS reset for image:

img {
    max-width: 100%;
    height: auto;
}

img {
    max-width: 100%;
}

What is the different between the resets with or without height? pros and cons?

Thank yo very much. Any additional comments will be greatly appreciated as always! Mahalo.