The concept behind mainside is a 2 column combination of main content and a smaller side area. The order can be reversed but several versions can be made using css grid and styling.
HORIZONTALLY ORIENTED
Main Area
Once I rose above the noise and confusion. Just to get a glimpse beyond this illusion. I was soaring ever higher but I flew too high…
Side Area
The point in mainside layouts is to imitate a larger width main content area and a narrower width side area (typical of a sidebar).