Code Block Height

Site URL: https://watermelon-clover-lj3m.squarespace.com/

I am making a grid using code blocks with html content (square image, with link).

I cannot figure out how to make the code block fix itself or wrap the content. When the window changes in size, I am left with a huge horizontal gap in the grid. I want to make the grid have fixed and equal margins.

Any help would be great!

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