Add a class of st-layout--compact to your container st-page.
All paddings and margins are smaller. Cards content padding are for example reduced by 50%. Also the font size is reduced to 12px as standard for paragraphs and body.
If you are a fan of slim layout perhaps, or have eyes like a hawk, this compressed layout let's you show more content in the viewport. However, be aware that not everyone has your eyes or hate for white-space.