As the screenshot shows, the Dropbox icon at the top panel in Xubuntu does not work along with the rest of the icon set. I am using Faenza icon set in this screenshot. But I've tried with other icon themes as well (such as obsidian, papirus etc) with the same result. Dropbox is not supporting the icon set. As a result the icon looks out of place. How can I make the Dropbox indicator icon to support the current icon theme?

I am using Xubuntu 18.04. Apart from this, the Dropbox itself works fine.