If you or someone on your team knows the CSS coding language, you can feel free to add custom CSS to your Hederis project that will be applied to your PDF. To do so:
Go to the Design preview, and make sure the “General Design Settings” option is selected.
Scroll down to find the Custom CSS Editor in the left sidebar, and click the + button to expand it.
Type your CSS in the text editor. To see it in the preview, press Save CSS, and then press Reflow Pages.