#EFEF40 Hex Color
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Sale banners and construction signage often reach for this luminous yellow. #efef40 is warm and neon but with a mellow edge that keeps it from turning harsh. Its high lightness makes it work best in accents and large type rather than full-page backgrounds. Black text on this hex code reaches about 17.1:1 contrast, so even small body copy stays readable.
Questions about #efef40
What is #efef40 in RGB, HSL and CMYK?
In RGB, #efef40 is rgb(239, 239, 64), in HSL hsl(60, 85%, 59%) and in CMYK 0%, 0%, 73%, 6%.
What colors pair well with #efef40?
Pair #efef40 with charcoal for a grounded, high-contrast look, or with deep plum for a punchy, unexpected combination. Both let the yellow stay the loudest element in the palette.
Where does #efef40 work best in a design?
#efef40 earns its spot as a small accent: sale badges, callout buttons, safety markings, or headline type. At large background sizes its brightness can feel tiring, so treat it as part of a 10% accent role.
Is #efef40 readable on white or black?
#efef40 has a 1.22:1 contrast ratio on white and 17.09:1 on black. WCAG asks for 4.5:1 for body text and 3:1 for large text, so on white it is too faint for text and on black it works for body text. Try other pairs in the contrast checker.