How to fix left and right sidebar and remains centre main content scrollable upside?

Hi I am stuck at a point.

Please tell me

How to I fixed my left and right sidebar and only leave main content scrollable.

(Please don't use bootstrap anywhere because I didn't use it in my project.)

Please use reference image of PDF file attached because I have better explained with images that actual I want.

Reference JPG View / Download here

Reference PDF View / Download here

Reference PPTX View / Download here

Please let me know if something not cleared. You can also take example of Facebook