Remove margins in table

Hi there! New here, and I know nothing about coding. Hopeing someone can help me. I have created a table in softr, and would like to remove the margins inside the text boxes. I have attached a screenshot and highlighted (in yellow), where I want to remove the margins. The idea is that the two grey boxes can touch on the inside edges, so that they appear to be one continuous grey box, hence the need to remove the white margin.

Thank you so much for your help!

Also, just to add, I am using ‘tags’ to create these filled boxes, which give the aesthetic i want. not sure if that makes a difference here. Thanks!