Underline is not enough to distinguish links

For this use case, I thought it could be interesting to get two underlinings (change the underlining height to have them both side by side). However the underlining height is a CSS property of the element, so it cannot be done. AFAICS, the only way to get double underlining is to use a "hackish" way to do it with a regular underline and a `border-bottom` -> https://stackoverflow.com/a/40861329