HTML table formatting not working

I am using Qualtrics to create an assessment for students. At the beginning of each module, I present some data in tables. To make the tables easier to read, I added some simple formatting in html (e.g., using for heading cells instead of , centering the data in the cells, etc.). When I click on the Rich Text editor, the tables appear formatted correctly. However, when I deploy the survey, the formatting doesn't appear and instead I get the ugly vanilla html formatting. Any idea on how to make what appears in the rich text editor the same as what appears for users?