Remove margin below main nav

the margin lies in here:

.entry-content, .entry-summary, .page-content {
    margin: 2em 0 0;
}

just set the 2em to zero. (via custom css i suppose - you'll only need the 'entry-content' selector)

If you use the Disable Elements meta box to remove the title (instead of hiding it with display:none;), it will remove that space for you: https://generatepress.com/knowledgebase/disable-elements/

thanks

Glad we could help :)