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CSS Colors - W3Schools
Blue Color Codes
100+ Shades of Blue Color Palettes — CSS Gradient
CSS colors - CSS: Cascading Style Sheets | MDN - MDN Web Docs
Applying color to HTML elements using CSS
CSS color values - CSS: Cascading Style Sheets | MDN - MDN Web Docs
Blue Color Palettes | CSSColors.com
Color - CSS-Tricks
CSS color codes & names - RapidTables.com
CSS RGB and RGBA Colors - W3Schools