I've been attempting to organize this on my own, but I'm having trouble figuring it out. I used flexbox to create a layout with a header, navigation, and a three-column section consisting of the main content area and two sidebars, one on each side. Now, I want to add another sidebar on the right, but I can't seem to make it work because I already set up the flex for the initial three columns...
To get a better idea of what I'm trying to achieve, you can view the image here
Check out the source code at www.codepen.io/enipx/details/dQmXKP