Give [Image Block: Card] white background, on top of a Pink Section Background

Site URL: https://pear-llama-mm6f.squarespace.com/

Hi all! 

I wanted to find out if it would be possible to add a background to my image block and make it white, so that the image card with the white background lies on top of the pink background and looks like in the image attached (or preferably just give the text a background as in the second image)? Would this be done with CSS? If so, would anyone be so kind as to share such a code with me?

Also, would it be possible to extend the height of the banner at the very top? At the current moment it's at 100% but I would love to make it longer and scrolly

The page is pear-llama-mm6f.squarespace.com

password: testing

Thank you so much!

You can add css code like so, I used Chrome extension Find Squarespace Ids to get the block id, you can use to change the id once you change the block 

#block-07bfa6f7cd1b61a72d88 {
      background: #fff;
      padding: 10px;
}