If you enlarge the page by quite a bit, you'll see the dotted border between the caption and the thead is where the white is coming from. Change your dotted border to a solid border, and it goes away. The HTML looks great and the CSS is quite groovy 🌈🦄😁 Great work!
https://codepen.io/artlessflapdragon/pen/eYejbyy
I can't seem to work out how to remove the 'whitespace' between the caption and thead...?
If you enlarge the page by quite a bit, you'll see the dotted border between the caption and the thead is where the white is coming from. Change your dotted border to a solid border, and it goes away. The HTML looks great and the CSS is quite groovy 🌈🦄😁 Great work!