File:Flag of Mexico.svg

The flag of Mexico.

It is from openclipart.org, specifically mexico.svg, by Cezary Biele.

According to Flag of Mexico, the colors are Green Pantone 3425 C and Red Pantone 186 C. According to  or, that translates to RGB 206, 17, 38 for the red, and RGB 0, 104, 71 for the green.