How can I change the size and color of the holographic weapon sight?

I'm talking about Aug's and SG553's sight below, NOT the default crosshair. Right now, it's yellow and too small. I want to make it red and way bigger. I know nothing on programming or Comp Sci.

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Solution 1:

You can use cl_crosshaircolor_b, cl_crosshaircolor_r, cl_crosshaircolor_g to determine the RGB colours of the crosshair, however, it is not currently possible to change the size of the sight crosshair