step 1: click on settings (the little cog on the left hand side of your screen)

step 2: click on controller

step 3: scroll down to controller bindings

step 4: click on spin 180

step5: click any button you want to bind the 180 spin to e.g i used mouse button 4

step 6: click the play cs go button on the left hand side of the screen botton and you're set

GL HF