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red · warm

#661a21

a dark, vivid red · warm · closest name: Maroon

Token name suggestion: Shadow Rust

RGB
102, 26, 33
HSL
355°, 59%, 25%
CMYK
0, 75, 68, 60
Luminance
0.0367

#661a21 is a dark vivid red, 355° on the wheel and 20/100 on the cool side. Put white text on it (12.11:1). As text it scores 12.11:1 on white — safe at any size. Nearest name is Maroon, nearest Tailwind family is stone.

hsl(355 59% 25%)rgb(102 26 33)Base step 900AAA inkWarm

At a glance

Every number on this page in one read: what #661a21 is made of, how bright it looks, and which way it leans.

Hex
#661a21
Hue
355°
red
Saturation
59%
vivid
Lightness
25%
dark
Brightness
40%
HSV value
Perceived
24%
weighted brightness
Luminance
0.0367
WCAG relative
Temperature
Warm
20/100 cool
Color family
Red
Tone
Vivid
Best ink
White
12.11:1
Closest name
Maroon
ΔE2000 10.8
Chroma
37.5
LCH, 0–130ish
OKLCH L
0.346
perceptual lightness
Tailwind
stone
500 · ΔE 29.7
Web-safe
#663333
nearest of 216
Where it sits
Hue355° of 360°
Saturation59%
Lightness25%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #661a21.

Temperature
Warm ← → Cool20% cool

Reads warm. Warm and cool siblings keep the same lightness, so you can swap one in without redoing your contrast maths.

Luminance by channel
Red77%
Green20%
Blue3%

Green carries most of what the eye calls brightness — that is why WCAG weights it 0.7152.

Every format

HEX#661a21
HEX (8-digit)#661a21ff
RGBrgb(102, 26, 33)
RGBArgba(102, 26, 33, 1)
HSLhsl(355, 59%, 25%)
HSV / HSBhsv(354, 75%, 40%)
HWBhwb(355 10% 60%)
CMYKcmyk(0%, 75%, 68%, 60%)
LABlab(22.6 34.2 15.3)
LCHlch(22.6 37.5 24.1)
OKLCHoklch(0.346 0.108 19.9)
XYZ (D65)xyz(6.12, 3.67, 1.83)
Decimal6691361
Display P3color(display-p3 0.400 0.102 0.129)
Web-safe#663333

Copy-ready code

every platformclick to select
/* CSS */
color: #661a21;
background-color: #661a21;
/* CSS custom property */
--brand: #661a21;
/* Tailwind (arbitrary) */
class="text-[#661a21] bg-[#661a21]"
/* SCSS */
$brand: #661a21;
/* SwiftUI */
Color(red: 0.400, green: 0.102, blue: 0.129)
/* UIKit */
UIColor(red: 0.400, green: 0.102, blue: 0.129, alpha: 1)
/* Android XML */
<color name="brand">#661A21</color>
/* Android Compose */
Color(0xFF661A21)
/* Flutter */
Color(0xFF661A21)
/* Python / OpenCV (BGR) */
(33, 26, 102)
/* Python / PIL (RGB) */
(102, 26, 33)
/* Java AWT */
new Color(102, 26, 33)
/* .NET */
Color.FromArgb(255, 102, 26, 33)
/* OpenGL / Unity (0–1) */
(0.4000f, 0.1020f, 0.1294f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{102,26,33}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #661a21 85%, white);
border-color: color-mix(in oklab, #661a21 40%, transparent);
/* theme-aware in one line */
color: light-dark(#661A21, #EED3D5);
/* relative colour syntax */
--hover: hsl(from #661a21 h s calc(l - 7));

Design tokens

The same ramp in the four formats a team actually needs. Paste one and the whole palette lands with it.

css custom propertiesclick to select
:root {
  --brand-50: #FBF4F4;
  --brand-100: #F7E9EA;
  --brand-200: #EFCDD0;
  --brand-300: #E8A6AC;
  --brand-400: #DD7982;
  --brand-500: #D14C58;
  --brand-600: #C3323F;
  --brand-700: #A32935;
  --brand-800: #82212A;
  --brand-900: #661a21;
  --brand-950: #3B1115;
  --brand: #661a21;
  --brand-ink: #ffffff;
  --brand-surface: #FAF4F5;
  --brand-border: #EDC0C4;
  --brand-hover: #4A1318;
  --brand-pressed: #2D0B0F;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #241415;
    --brand-ink: #EED3D5;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#FBF4F4',
        100: '#F7E9EA',
        200: '#EFCDD0',
        300: '#E8A6AC',
        400: '#DD7982',
        500: '#D14C58',
        600: '#C3323F',
        700: '#A32935',
        800: '#82212A',
        900: '#661a21',
        950: '#3B1115',
        DEFAULT: '#661a21',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #FBF4F4,
  '100': #F7E9EA,
  '200': #EFCDD0,
  '300': #E8A6AC,
  '400': #DD7982,
  '500': #D14C58,
  '600': #C3323F,
  '700': #A32935,
  '800': #82212A,
  '900': #661a21,
  '950': #3B1115,
);
$brand-base: #661a21;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#FBF4F4", "$type": "color" },
      "100": { "$value": "#F7E9EA", "$type": "color" },
      "200": { "$value": "#EFCDD0", "$type": "color" },
      "300": { "$value": "#E8A6AC", "$type": "color" },
      "400": { "$value": "#DD7982", "$type": "color" },
      "500": { "$value": "#D14C58", "$type": "color" },
      "600": { "$value": "#C3323F", "$type": "color" },
      "700": { "$value": "#A32935", "$type": "color" },
      "800": { "$value": "#82212A", "$type": "color" },
      "900": { "$value": "#661a21", "$type": "color" },
      "950": { "$value": "#3B1115", "$type": "color" }
    },
    "brandInk": { "$value": "#ffffff", "$type": "color" }
  }
}

Best text color

Only one of black and white can be right. This is the one, with the number that proves it.

Readable at a glance#ffffff on #661a21 · 12.11:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 12.11:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 1.73:1
AA fail · AA large fail · AAA fail
Reading the other direction: #661a21 as text scores 12.11:1 on white and 1.73:1 on black.
Best tinted ink on it, if plain black or white feels flat: #FAEBEC at 10.47:1.

Make it accessible

A contrast checker tells you that you failed. This tells you what to ship instead — same hue, same saturation, lightness moved only as far as WCAG demands.

The quick fox
#661a21 · 12.11:1
AA on whitealready passes
#661a21
The quick fox
#661a21 · 12.11:1
AAA on whitealready passes
#661a21
The quick fox
#CF4451 · 4.60:1
AA on black+29% L
#CF4451
The quick fox
#DD7982 · 7.13:1
AAA on black+42% L
#DD7982

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #661A21 is enough for headings on white. Non-text elements such as icons, chart strokes and focus rings also sit at 3:1 under WCAG 2.2 (1.4.11).

Accessibility — WCAG contrast

Aa
#661a21 on white: 12.11:1
AA ✓ pass · AA-large · AAA
Aa
#661a21 on black: 1.73:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #661a21 as text on that neutral, and that neutral as text on #661a21.

NeutralRatioBoth directions
White12.11:1AaAa
Slate 5011.57:1AaAa
Slate 10011.05:1AaAa
Slate 2009.82:1AaAa
Slate 3008.15:1AaAa
Slate 4004.72:1AaAa
Slate 5002.54:1AaAa
Slate 6001.60:1AaAa
Slate 7001.17:1AaAa
Slate 8001.21:1AaAa
Slate 9001.47:1AaAa
Black1.73:1AaAa
Colour vision deficiency
true color
protanopia · #2F2C21
deuteranopia · #423C1F
tritanopia · #70051D

Roughly one man in twelve has some form of colour vision deficiency. If any of the three panels above is hard to tell apart from a neighbouring colour in your palette, add a shape, an icon or a label so the meaning does not rest on hue alone.

Color scale — 50 to 950

A Tailwind-shaped ramp built around this exact hex. #661a21 is pinned to step 900; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#FBF4F4
#F7E9EA
#EFCDD0
#E8A6AC
#DD7982
#D14C58
#C3323F
#A32935
#82212A
#661a21
#3B1115
Base = 900Lightest = 50 · #FBF4F4Darkest = 950 · #3B1115Text step on white = 600
Perceptual ramp — OKLCH

The same eleven steps expressed in OKLCH, where equal lightness numbers actually look equally spaced. HSL ramps go muddy in the yellows and washed out in the blues; this one does not. Modern browsers render it natively — the hex ramp above is the fallback.

50100200300400500600700800900950
oklch tokensclick to select
:root {
  --brand-50: oklch(0.97 0.027 19.9);
  --brand-100: oklch(0.94 0.043 19.9);
  --brand-200: oklch(0.88 0.065 19.9);
  --brand-300: oklch(0.80 0.084 19.9);
  --brand-400: oklch(0.72 0.099 19.9);
  --brand-500: oklch(0.64 0.108 19.9);
  --brand-600: oklch(0.56 0.108 19.9);
  --brand-700: oklch(0.48 0.101 19.9);
  --brand-800: oklch(0.40 0.091 19.9);
  --brand-900: oklch(0.32 0.076 19.9);
  --brand-950: oklch(0.24 0.059 19.9);
}

Colors that work with #661a21

Not a palette — a role sheet. Each swatch answers one question you will hit while building the component.

Text on it#ffffff
White wins here
Surface#FAF4F5
Tinted page background
Border#EDC0C4
Hairlines and dividers
Muted text#9B4B52
Captions on the surface
Accent#17694D
Second voice, not a rival
Dark variant#661A21
Hover, pressed, headers
Light variant#FAEBEC
Selected rows, tints
Dark surface#241415
Dark-mode background
Hover#4A1318
One step down in lightness
Pressed#2D0B0F
Two steps down
Disabled#935E63
Chroma pulled out
Focus ring#7E1720
Offset from the fill so it reads
Light mode
Everything in its place

Surface, border, heading and body all derive from this one hue, so the screen stays coherent without a second palette.

Primary actionSecondaryBadge
Dark mode
Same hue, inverted

Lightness flips, hue holds. The accent stays the anchor in both themes.

Primary actionSecondaryAccent

In real components

The same eight roles, wired into the interface patterns you will actually build with them. Every state below is a computed value, not a mock-up.

Buttons and states
Save changesHoverPressedDisabled
OutlineSubtleLinkFocused
Form field
you@company.com

Focus ring uses the light variant so the field still reads as one shape.

Send me product updates
Notice
Your export is ready

The file stays available for seven days. Download it before it expires.

NewBetaDraft
Data
Storage used68%
Acme LtdActive
NorthwindTrial
GlobexActive

How to use #661a21

Derived from its contrast, chroma and lightness — not from taste.

Works well for
  • Body text and links on white
  • Primary buttons and calls to action
  • Focus rings, active and selected states
  • Headers, footers and dark-mode surfaces
  • Brand accents, badges and data highlights
Use with care
  • Text on black or near-black surfaces
  • Full-page backgrounds — tiring over long sessions
  • Black text placed on it
  • Status meaning — pair it with an icon or label, never colour alone
  • Pairing with a same-lightness hue — edges vibrate
Minimum size as text on white
Any size
Safe as a fill behind white type
Yes
Safe as a 1px border on white
Yes

Meaning and mood

What a colour in this family tends to signal, and how this particular chroma and lightness change the reading.

urgentappetisingboldphysical

Red arrives before the rest of the page does. It raises attention and appetite, which is why it runs food, sport and clearance pricing.

This is a confident chroma: strong enough to lead a brand, restrained enough to live in an interface all day. The low lightness adds weight and formality.

Worth knowing

It is also the universal error colour. Use it as a brand accent and users may read a warning that is not there.

Reads as
  • FormalityHigh
  • EnergyMedium-high
  • Weight75/100
  • TemperatureWarm
  • ApproachabilityHigh

Colour associations are cultural and vary by market. Treat these as a starting point for a conversation with your audience, not a finding about them.

Similar colors

One move away from this hex in each direction. Every swatch is its own page.

Color relationships

The wheel positions with their names attached, so you can grab the one you actually need.

Complementary#1A665F
Analogous left#661A47
Analogous right#66391A
Split-complement 1#1A6639
Split-complement 2#1A4766
Triadic 1#21661A
Triadic 2#1A2166
Tetradic#47661A
On the wheel
Base+30°−30°+120°+240°+180°355°

#661a21 sits at 355°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red40.0%
Green10.2%
Blue12.9%
R · 0–255
102
0x66
G · 0–255
26
0x1a
B · 0–255
33
0x21

CMYK percentages

Cyan0.0%
Magenta74.5%
Yellow67.6%
Key (black)60.0%

Total ink coverage is 202%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#661a21 text on a black background

contrast 1.73:1

Card sample

#661a21 text on a white background

contrast 12.11:1

Card sample

#661a21 on grey

11.05:1

#661a21 on its own surface

11.14:1

#661a21 on its dark surface

1.46:1

CSS3 live lab

Text font color

The quick brown fox

color: #661a21;
Background color
Panel with #661a21 background
background-color: #661a21;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #661a21;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(102, 26, 33, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(102, 26, 33, 0.45);
Border & gradient
Gradient panel
border: 3px solid #661a21;
background: linear-gradient(135deg, #661a21, #66461A);
Gradient text

Gradient headline

background: linear-gradient(90deg, #661a21, #66591A);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #661a21;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #661a21;
caret-color: #661a21;
Left rule
Pull quote or callout
border-left: 4px solid #661a21;
Ring + tint
Selected chip
background: #FAEBEC;
box-shadow: inset 0 0 0 2px #661a21;
Conic badge
68%
background: conic-gradient(#661a21 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #661a21 over white; the bottom row is the same alpha over a checkerboard, so you can see what survives on a photo or a video.

Bottom row of hexes is the flattened result over white — use those when a design tool refuses transparency, or when you need a solid fallback.

alpha in every syntaxclick to select
rgba(102, 26, 33, 0.5)
rgb(102 26 33 / 50%)
#661a2180
hsl(355 59% 25% / 50%)
color-mix(in srgb, #661a21 50%, transparent)
Alpha8-digit hexFlat on white
10%#661a211a#F0E8E9
20%#661a2133#E0D1D3
40%#661a2166#C2A3A6
60%#661a2199#A3767A
80%#661a21cc#85484D

Gradients from #661a21

Six recipes, each built from this hex and shown with the exact CSS that produced it.

Elevation
Same hue, three lightnesses — safe anywhere
background: linear-gradient(135deg, #972631, #661a21 45%, #661A21);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #661a21, #4E3A14);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #661a21, #1A665F);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #AF2D39 0%, #661a21 45%, #661A21 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #FAF4F5, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #8F246C 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #7E4F20 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #661A21 0%, transparent 65%), #661a21;

Monochromatic scale

Palettes built from #661a21

Shades — darker

Tints — lighter

Tones — desaturated

Color harmonies

Nearest named colors

Ranked with CIEDE2000 across all 139 CSS keywords. Under ΔE 2 the eye stops telling them apart; over ΔE 10 they are plainly different colors.

#661a21 in the real world

Where a color in this family tends to land, and the interface roles it is usually asked to play.

Industries
Food and drinkEntertainmentRetailSport
Common UI roles
ButtonsLinksFocus statesCharts
Print note

Converts to four-color process without much drama. Proof it anyway.

On screens

Very dark values collapse into each other on cheap panels — leave more lightness between your darkest steps than the numbers suggest.

In dark mode

Too dim on dark surfaces at 1.73:1 — lift it to #CF4451 for body text, or reserve it for fills.

Explore nearby colors

Small, deliberate steps away from this hex — useful when you are hunting for the version of a colour that finally feels right.

#661a21, answered

What color is #661a21?

#661a21 is a dark vivid red, closest to Maroon (ΔE2000 10.8). It sits at 355° on the hue wheel with 59% saturation and 25% lightness, which reads as warm.

What is the RGB value of #661a21?

rgb(102, 26, 33) — 102 red, 26 green and 33 blue out of 255, or 40% / 10.2% / 12.9% by channel.

What is #661a21 in HSL and HSV?

hsl(355, 59%, 25%) and hsv(354, 75%, 40%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #661a21 a light or a dark color?

It is a dark color. Relative luminance is 0.0367 and perceived brightness is 24%, so white text on it reaches 12.11:1.

Should I use black or white text on #661a21?

White. It scores 12.11:1 against #661a21, versus 1.73:1 for black — AAA at any size.

Is #661a21 accessible on a white background?

#661a21 on white scores 12.11:1, which clears AAA at every size.

What is the complementary color of #661a21?

#1A665F sits directly opposite on the wheel. Softer options are the split-complements #1A6639 and #1A4766, which give the same contrast with far less vibration.

What colors go well with #661a21?

For interface work: #FAF4F5 as the surface, #EDC0C4 for borders, #9B4B52 for secondary text, #17694D as an accent and #661A21 for hover and pressed states. For a palette, the analogous pair #661A47 and #66391A stays calm, while #1A665F is the loudest partner.

What is #661a21 in CMYK for printing?

cmyk(0%, 75%, 68%, 60%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #661a21 warm or cool?

Warm — it scores 20 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #662F1A; nudged cooler, #67193D.

Which Tailwind color is closest to #661a21?

The stone family — its 500 step is #78716c, ΔE2000 29.7 away. That is a visible difference, so define #661a21 as a custom token rather than reaching for the built-in.

How do I use #661a21 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#661a21] or text-[#661a21], or register the whole ramp under theme.extend.colors.brand so you get bg-brand-500 and friends. The generated 50–950 scale on this page is ready to paste into your config.

What is #661a21 with 50% opacity?

rgba(102, 26, 33, 0.5), or #661a2180 in eight-digit hex. Over white that composites to #B38D90; over black, #330D11.

Is #661a21 a web-safe color?

No. The nearest web-safe colour is #663333, ΔE2000 6.6 away. The palette only matters for legacy displays and some email clients now.

What does the color #661a21 mean?

As a red, it reads urgent, appetising, bold. Red arrives before the rest of the page does. It raises attention and appetite, which is why it runs food, sport and clearance pricing. At this chroma the effect is amplified — it will dominate whatever sits beside it.

What gradient works with #661a21?

The safest is same-hue elevation: linear-gradient(135deg, #972631, #661a21 45%, #661A21). For more colour, a short hue run to #4E3A14 keeps it rich without turning muddy.

Work with #661a21 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #661a21 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.