CS GO Crosshair:
cl_crosshairalpha "255";cl_crosshaircolor "4";cl_crosshaircolor_b "250";cl_crosshaircolor_r "50";cl_crosshaircolor_g "250";cl_crosshairdot "1";cl_crosshairgap "0";cl_crosshairsize "2";cl_crosshairstyle "4";cl_crosshairusealpha "1";cl_crosshairthickness "0.5";cl_fixedcrosshairgap "0";cl_crosshair_outlinethickness "0";cl_crosshair_drawoutline "0";

cl_crosshairalpha "255";cl_crosshaircolor "4";cl_crosshaircolor_b "250";cl_crosshaircolor_r "50";cl_crosshaircolor_g "250";cl_crosshairdot "0";cl_crosshairgap "-2";cl_crosshairsize "1";cl_crosshairstyle "4";cl_crosshairusealpha "1";cl_crosshairthickness "1";cl_fixedcrosshairgap "-2";cl_crosshair_outlinethickness "0";cl_crosshair_drawoutline "0";

Screams crosshair:
cl_crosshair_drawoutline 0;cl_crosshaircolor 4;cl_crosshairdot 0;cl_crosshairgap -1;cl_crosshairgap_useweaponvalue 0;cl_crosshairsize 1;cl_crosshairstyle 4;cl_crosshairthickness 0

mat_monitorgamma ## (value), 1.6 brightest, higher value = dimmer