Unable to make completely correct but here it is.

Hmm.. your solution looks great! Just that your card is not aligned in center vertically. Set min-height:100vh instead of height in body selector, and remove overflow: hidden and you are good to go. In fact it's great to never use overflow: hidden unless really required. Setting min-height on body to 100 of the viewport height is also a good thing you will need in most of the solutions.

Good luck for your future projects as well. Happy coding :)

Oops! my design is little bit smaller as in my pc this is exceeding over 100vh height even.