#2D517CSlumber (#2D517C) is a dark, soft blue with an OKLCH hue of 254°, lightness 0.43 and chroma 0.083. It sits on the cool side of the color wheel. In practice it behaves as a mid-weight working color for secondary surfaces and editorial blocks.
| HEX | #2D517C |
|---|---|
| RGB | rgb(45, 81, 124) |
| HSL | hsl(213, 47%, 33%) |
| HSV | hsv(213, 64%, 49%) |
| CMYK | cmyk(64%, 35%, 0%, 51%) |
| CIE Lab | lab(33.8 1.5 -28.2) |
| OKLCH | oklch(0.429 0.083 254) |
Under warm 2700K interior light Slumber shifts subtly: leans toward purple; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 1.5), so it is a lighting-stable choice.
#354f74 — ΔE 1.5, shifts subtly: leans toward purple#32527a — ΔE 0.8, is virtually unchanged#2d517c — ΔE 0.0, is virtually unchanged#2c517e — ΔE 0.3, is virtually unchangedTest Slumber in the color lighting simulator — sweep it through daylight, warm 2700K light, 4000K LED, and shade alongside the rest of your palette.
Against white it measures 8.14:1 and against black 2.58:1, so white text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid black text on this color entirely.
One color explored: close hues with real lightness and chroma structure, so the palette is the anchor through value rather than a set of colors.
#91add1 · #6887ae · #41638d · #2d517c · #012042 · #00051a
The anchor's neighbours on the wheel — everything shares an undertone, so the chord carries color without anything having to be muted to get along.
#437a8c · #346685 · #2d517c · #303c68 · #2e2a52 · #27183b
The mid-gap pairing — sage and mustard, terracotta and olive. A foil rotated 40–65° toward warm or cool: too far to be kin, too near to argue, carried by temperature and a deliberate value offset.
#aea0bf · #957cb1 · #71667f · #2d517c · #193658 · #031d3b
One deliberately opposed voice — a single restrained counterpoint across the wheel, or temperature against temperature where the anchor is too muted to carry a loud opposite.
#e0b883 · #7e91a8 · #656f7d · #2d517c · #22344a · #0f1925
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#f7f1e9 · #a4abb5 · #6c6863 · #2d517c · #313842 · #040201
This color as a ground rather than a subject — its own restraint held across a narrow value band, carrying one saturated voice from the opposite temperature.
#f7f1e8 · #d2cac0 · #a89f94 · #352b1d · #140a00 · #2d517c
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#fcf0e0 · #c4a57c · #85612d · #2d517c · #4d3102 · #00020d
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#fcf0e0 · #cf9e89 · #716b2d · #2d517c · #552a17 · #040300
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffedee · #d19a9e · #557341 · #2d517c · #283f17 · #090001
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#ffecf6 · #ca9ab5 · #85612d · #2d517c · #03432e · #130700
#4B6B92 · #6985A9 · #88A1BF · #A8BDD6 · #C9D9EE
#23436A · #193658 · #0F2948 · #071D37 · #011128
#365173 · #3D516A · #445160
Its moderate chroma lets it work in mid-size areas — upholstery, secondary UI surfaces, editorial blocks — without overwhelming neighbors. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.