Exploring the Color #405B11

#405B11 sits at 82° on the color wheel, placing it in the chartreuse family of the neutral half of the spectrum. With 69% saturation and 21% lightness, it reads as a richly saturated, deep tone — a weighted, dramatic presence with deep undertones. Its RGB mix of 64, 91, 17 produces a 7.71:1 contrast ratio against white, which clears WCAG AAA for body text in that pairing.

In RGB space #405B11 is a clear variant of CSS forest green — about 59 units away from #228B22. Designers reach for chartreuse hues at this saturation when the brief calls for a conversational, mid-energy register, and at this lightness when they want weight, depth, and grounded contrast. On screen the balanced cast tends to pair best with either warm or cool accents depending on the surrounding palette.

Darkening Shades

Lightening Shades