Replying to an old post…I know. But it shows up in search engine results.
One way to easily/cleanly make this adjustment is included in the sample custom.css. Below is an example with the relevant parts only, and adjustments to my preferences (were all 60px
values before).
:root {
--gap-body-top: 10px;
--gap-body-right: 20px;
--gap-body-bottom: 10px;
--gap-body-left: 20px;
}