How to change padding value in AMP?

Question

css

On the site , you need to assign the value of padding-top: 56% to the thumbnails of the post images. But I can't figure out what code to write for this. I looked through the console, tried different options, but nothing changes. Please tell me the solution.

Answer 1

What is the problem?

.penci-archive__list_posts .entry-media img{
 padding-top:56%;
}