Disk Space Report: <span style="font-weight:bold; color:<?relevance if free space of drive of system folder < 10000000 then "red" else "green" ?>;"><?relevance if free space of drive of system folder < 10000000 then "Low disk space" else "Healthy" ?></span>
Thanks, @FatScottishGuy! After a long battle, I realized that I needed to split the relevance to apply the required formatting and you gave me a great head start. Really appreciate. FYI I used tiles in HTML for my relevance and applied the necessary formatting to the tile classes.