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A HEXA color code often written as "hex with alpha" is a hexadecimal color representation that includes an alpha component, similar to the rgba color format. In this format, in addition to the standard six characters that define the red, green, and blue (RGB) components, two additional characters represent the alpha channel, which controls the color's transparency or opacity. The alpha channel ranges from 00 (completely transparent) to FF (completely opaque), allowing for a wide range of transparency levels in a color. This format is commonly used in web design and graphic design to specify colors with transparency, providing control over the visual appearance of elements on a web page or in digital graphics.
OKLCH is a color space that combines the perceptual uniformity of OKLAB with the intuitive cylindrical coordinates of LCH (Lightness, Chroma, Hue). It is increasingly becoming the preferred color space for modern web design and CSS because it allows for predictable color manipulation—such as creating harmonious palettes or adjusting lightness without shifting the perceived hue—better than HSL or standard LCH. It is natively supported in modern CSS Color Module Level 4, enabling more vibrant and accessible color schemes.