HTML and CSS only

This is my first challenge. My goal was to be able to complete it with what I know. There are a number of things I could of done better and already recognized a few things I will change when I tackle the next challenge.

Would specifically like feedback around getting my main card container to stay center as the screen size changes. It does not have additional responsiveness items such as clamp or min/max but would like to at least have it stay centered.