#FFEF11 Hex Color
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Close to the glow of a fresh highlighter marker, #ffef11 is a luminous neon yellow with a warm, mellow streak. That brightness works hardest in small doses, so treat it as a 10% accent in a 60/30/10 scheme: sale badges, safety signage, call-to-action buttons. Set black text on it for a contrast ratio around 17.6:1, comfortably past WCAG AA, or ground it next to charcoal and navy so the glow reads intentional instead of blinding.
Questions about #ffef11
What is #ffef11 in RGB, HSL and CMYK?
In RGB, #ffef11 is rgb(255, 239, 17), in HSL hsl(56, 100%, 53%) and in CMYK 0%, 6%, 93%, 0%.
What colors pair well with #ffef11?
Charcoal, navy, and plain black flatter #ffef11 best. Black text on #ffef11 hits a contrast ratio around 17.6:1, well past the WCAG AA minimum of 4.5:1, which makes the pair a safe pick for sale banners and warning labels.
Is #ffef11 a warm or cool yellow?
It reads warm. The hex carries a bright, sunlit quality with a slight green cast at the edges, so it feels energetic rather than creamy. Because of that intensity, use it as an accent instead of a full background; large fields of it can overwhelm a layout.
Is #ffef11 readable on white or black?
#ffef11 has a 1.19:1 contrast ratio on white and 17.60:1 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.