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The reason why the cells are overflowing is that they have a set Minimum Width and Height. To fix that, set those to 0 first.
Setting a minimum width is not a good option to set a structure to the cells. To maintain that almost square cells. Use the Cell’s Top Padding and set a percent value like 50%.
That will, of course, push the Cell’s contents down so you need to add a Div element to each Cell and insert your Headline to the Div element. The Div element has a Position option so you can set it to Absolute position so it can be positioned anywhere in the cell without taking up space.
The value of 50% will make the div with the headline be off center so you will need to go to the Div’s Effects and put in
translateY(-50%) in the Transform field.
That will keep the Div with Headline centered at any screen size.
Hope that helps.