Panels Content First

This module contains content-first panels layouts with the following properties:

• Apart from the main content region, all regions are adaptive, so they are not shown if they have no content
• The content region adapts its size depending on the sidebars
• The content region is rendered above the sidebars, so in responsive mobile layout content is on top (note: you need to add breakpoints and css for this)

Currently it contains

• A 3-column 25-50-25 layout

Drupal 8

See Content First Layouts