Take full control of the viewer styling when the style editor is not enough.
If your brand needs something the style editor cannot express, you can inject your own CSS into the viewer.Go to Settings → Customization and click Use your own CSS. The button turns dark and reads Custom CSS enabled; a code editor opens underneath.
Settings → Customization → Use your own CSS
Custom CSS is the one part of the editor that does not autosave. Click Save CSS — the indicator next to the button shows Unsaved changes, Saving… or Saved.
Overriding the variables keeps light mode, dark mode and every component consistent. Reach for element selectors only when a variable cannot do the job.
Open your published Visit, right-click an element and choose Inspect to find the exact class you need. Every class the viewer uses starts with iv_ or pp_.
Custom CSS is powerful and unsupported by definition — a future viewer update can change an internal class name. Stick to the variables where you can, keep your overrides short, and re-check them after a release.
