How increase size of text in RSS feed

I have started using Devonthink for my RSS feeds. It is useful to me because I am in Devonthink so much during the day. However the text is tiny…really tiny…

I have tried playing with the settings but cant rectify this.

Any ideas how I can increase default font size in an RSS feed.?

Unless the styling is defined by the contents of the feed on its own, the stylesheet selected in Preferences > RSS controls the appearance.