With Super themes you can instantly customize your site’s design with zero coding knowledge.
Super themes transform your Notion page into a professional website you'll want to share. You can customize the appearance of Notion blocks without coding — straight from your Super site dashboard. Dive in all the different design options and find the look that speaks to you.
Creating the theme directly on Themes Section - You can view, edit and apply all your themes from the Themes menu which is at the top level of your Super Dashboard.

You can also view, edit, preview and apply a theme to your current site by using the Design menu in the site dashboard. Creating a theme while you’re editing your Site on your Super Dashboard.
Head to your Super site dashboard and select Design
Under Site Design, press Turn into a Theme
Click the Super icon the upper left corner and Go to Themes
Rename your Theme.

Then, you can proceed on Editing the Theme
You can now customize your theme and save all changes by clicking Save at the top.

In the Colors section, you can toggle between light and dark Default color modes for your site.

You can then customize each mode: