Table Borders Showing (opens in new tab)

My work colleagues have outlook signatures. They use tables and the borders in their tables don't show. I created my signature in Microsoft word and made mine look very similar and made the borders transparent. I used these settings to make the border of the tables transparent:I pasted it into the signature in Outlook, but the borders show.The editor in Outlook does not give the option to remove the borders.What do I do?