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The hexadecimal color code #101C21 is a very dark, muted shade of Cyan (known as black). In the RGB color model, #101C21 is comprised of 16 red, 28 green, and 33 blue. In the HSL color space, which is often used in digital design and color grading, it has a hue of 198 degrees, a saturation of 35%, and a lightness of 10%. This color has an approximate wavelength of 513 nm. The closest web-safe color is often utilized in web design, user interfaces (UI), and vector graphics to create muted Cyan atmospheres. Designers searching for Cyan color schemes often pair this with its complementary color or use it as an accent against neutral backgrounds. It is commonly used in digital design for backgrounds, typography, and accent elements. When paired with its complementary color in the palette below, it creates a high-contrast visual hierarchy. Engineers can implement this color using the CSS hex code #101C21.