Neque porro quisquam est qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit...
Click "Select page" -> right sidebar "Show/hide slide by URL hash" -> change the section config
The default font is "Fira Code". You can click each slide to see it. Or you can "Meta + click" to multi select all the slide and change all the custom styles together.
All of the "position:absolute" elements are in the first slide for simplicity. Like the 3 buttons on the top left and the icon button list on the left.