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The hexadecimal color code #666DB7 is a medium, muted shade of Blue (known as slateblue). In the RGB color model, #666DB7 is comprised of 102 red, 109 green, and 183 blue. In the HSL color space, which is often used in digital design and color grading, it has a hue of 235 degrees, a saturation of 36%, and a lightness of 56%. This color has an approximate wavelength of 487 nm. The closest web-safe color is often utilized in web design, user interfaces (UI), and vector graphics to create muted Blue atmospheres. Designers searching for Blue 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 #666DB7.