crosshair :

cl_crosshairalpha 250; cl_crosshaircolor 2;
cl_crosshairdot 1; cl_crosshairgap -1;
cl_crosshairsize 1; cl_crosshairstyle 4;
cl_crosshairusealpha 1; cl_crosshairthickness 0.5;
cl_crosshair_drawoutline 0;