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red · warm

#da0a21

a dark, electric red · warm · closest name: Crimson

Token name suggestion: Shadow Rust

RGB
218, 10, 33
HSL
353°, 91%, 45%
CMYK
0, 95, 85, 15
Luminance
0.1523

#da0a21 is a dark electric red, 353° on the wheel and 20/100 on the cool side. Put white text on it (5.19:1). As text it scores 5.19:1 on white — safe at any size. Nearest name is Crimson, nearest Tailwind family is red.

hsl(353 91% 45%)rgb(218 10 33)Base step 600AA inkWarm

At a glance

Every number on this page in one read: what #da0a21 is made of, how bright it looks, and which way it leans.

Hex
#da0a21
Hue
353°
red
Saturation
91%
electric
Lightness
45%
dark
Brightness
85%
HSV value
Perceived
47%
weighted brightness
Luminance
0.1523
WCAG relative
Temperature
Warm
20/100 cool
Color family
Red
Tone
Electric
Best ink
White
5.19:1
Closest name
Crimson
ΔE2000 6.4
Chroma
85.2
LCH, 0–130ish
OKLCH L
0.562
perceptual lightness
Tailwind
red
500 · ΔE 9.5
Web-safe
#CC0033
nearest of 216
Where it sits
Hue353° of 360°
Saturation91%
Lightness45%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #da0a21.

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
Red98%
Green1%
Blue1%

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

Every format

HEX#da0a21
HEX (8-digit)#da0a21ff
RGBrgb(218, 10, 33)
RGBArgba(218, 10, 33, 1)
HSLhsl(353, 91%, 45%)
HSV / HSBhsv(353, 95%, 85%)
HWBhwb(353 4% 15%)
CMYKcmyk(0%, 95%, 85%, 15%)
LABlab(46.0 70.7 47.5)
LCHlch(46.0 85.2 33.9)
OKLCHoklch(0.562 0.225 25.9)
XYZ (D65)xyz(29.30, 15.24, 2.84)
Decimal14289441
Display P3color(display-p3 0.855 0.039 0.129)
Web-safe#CC0033

Copy-ready code

every platformclick to select
/* CSS */
color: #da0a21;
background-color: #da0a21;
/* CSS custom property */
--brand: #da0a21;
/* Tailwind (arbitrary) */
class="text-[#da0a21] bg-[#da0a21]"
/* SCSS */
$brand: #da0a21;
/* SwiftUI */
Color(red: 0.855, green: 0.039, blue: 0.129)
/* UIKit */
UIColor(red: 0.855, green: 0.039, blue: 0.129, alpha: 1)
/* Android XML */
<color name="brand">#DA0A21</color>
/* Android Compose */
Color(0xFFDA0A21)
/* Flutter */
Color(0xFFDA0A21)
/* Python / OpenCV (BGR) */
(33, 10, 218)
/* Python / PIL (RGB) */
(218, 10, 33)
/* Java AWT */
new Color(218, 10, 33)
/* .NET */
Color.FromArgb(255, 218, 10, 33)
/* OpenGL / Unity (0–1) */
(0.8549f, 0.0392f, 0.1294f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{218,10,33}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #da0a21 85%, white);
border-color: color-mix(in oklab, #da0a21 40%, transparent);
/* theme-aware in one line */
color: light-dark(#7A0612, #EED3D6);
/* relative colour syntax */
--hover: hsl(from #da0a21 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: #FDF2F3;
  --brand-100: #FBE5E7;
  --brand-200: #F9C3C9;
  --brand-300: #FA949F;
  --brand-400: #F85E6F;
  --brand-500: #F5283F;
  --brand-600: #da0a21;
  --brand-700: #C3091D;
  --brand-800: #9C0718;
  --brand-900: #710A15;
  --brand-950: #46060D;
  --brand: #da0a21;
  --brand-ink: #ffffff;
  --brand-surface: #FAF4F5;
  --brand-border: #EDC0C5;
  --brand-hover: #B8081C;
  --brand-pressed: #960717;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #241415;
    --brand-ink: #EED3D6;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#FDF2F3',
        100: '#FBE5E7',
        200: '#F9C3C9',
        300: '#FA949F',
        400: '#F85E6F',
        500: '#F5283F',
        600: '#da0a21',
        700: '#C3091D',
        800: '#9C0718',
        900: '#710A15',
        950: '#46060D',
        DEFAULT: '#da0a21',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #FDF2F3,
  '100': #FBE5E7,
  '200': #F9C3C9,
  '300': #FA949F,
  '400': #F85E6F,
  '500': #F5283F,
  '600': #da0a21,
  '700': #C3091D,
  '800': #9C0718,
  '900': #710A15,
  '950': #46060D,
);
$brand-base: #da0a21;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#FDF2F3", "$type": "color" },
      "100": { "$value": "#FBE5E7", "$type": "color" },
      "200": { "$value": "#F9C3C9", "$type": "color" },
      "300": { "$value": "#FA949F", "$type": "color" },
      "400": { "$value": "#F85E6F", "$type": "color" },
      "500": { "$value": "#F5283F", "$type": "color" },
      "600": { "$value": "#da0a21", "$type": "color" },
      "700": { "$value": "#C3091D", "$type": "color" },
      "800": { "$value": "#9C0718", "$type": "color" },
      "900": { "$value": "#710A15", "$type": "color" },
      "950": { "$value": "#46060D", "$type": "color" }
    },
    "brandInk": { "$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 #da0a21 · 5.19:1
Use #ffffffAA at every size, AAA for large text only.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 5.19:1 · recommended
AA pass · AA large pass · AAA fail
Aa
Black text · 4.05:1
AA fail · AA large pass · AAA fail
Reading the other direction: #da0a21 as text scores 5.19:1 on white and 4.05:1 on black.
Best tinted ink on it, if plain black or white feels flat: #FEE7E9 at 4.40:1.

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
#da0a21 · 5.19:1
AA on whitealready passes
#da0a21
The quick fox
#B3081B · 7.08:1
AAA on white−8% L
#B3081B
The quick fox
#E90B23 · 4.54:1
AA on black+3% L
#E90B23
The quick fox
#F86676 · 7.15:1
AAA on black+24% L
#F86676

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #DA0A21 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
#da0a21 on white: 5.19:1
AA ✓ pass · AA-large · AAA
Aa
#da0a21 on black: 4.05:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #da0a21 as text on that neutral, and that neutral as text on #da0a21.

NeutralRatioBoth directions
White5.19:1AaAa
Slate 504.96:1AaAa
Slate 1004.74:1AaAa
Slate 2004.21:1AaAa
Slate 3003.50:1AaAa
Slate 4002.02:1AaAa
Slate 5001.09:1AaAa
Slate 6001.46:1AaAa
Slate 7002.00:1AaAa
Slate 8002.82:1AaAa
Slate 9003.44:1AaAa
Black4.05:1AaAa
Colour vision deficiency
true color
protanopia · #5C521E
deuteranopia · #8B7B13
tritanopia · #F1001A

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. #da0a21 is pinned to step 600; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#FDF2F3
#FBE5E7
#F9C3C9
#FA949F
#F85E6F
#F5283F
#da0a21
#C3091D
#9C0718
#710A15
#46060D
Base = 600Lightest = 50 · #FDF2F3Darkest = 950 · #46060DText 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 0.056 25.9);
  --brand-100: oklch(0.94 0.090 25.9);
  --brand-200: oklch(0.88 0.135 25.9);
  --brand-300: oklch(0.80 0.175 25.9);
  --brand-400: oklch(0.72 0.207 25.9);
  --brand-500: oklch(0.64 0.225 25.9);
  --brand-600: oklch(0.56 0.225 25.9);
  --brand-700: oklch(0.48 0.211 25.9);
  --brand-800: oklch(0.40 0.189 25.9);
  --brand-900: oklch(0.32 0.157 25.9);
  --brand-950: oklch(0.24 0.124 25.9);
}

Colors that work with #da0a21

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#EDC0C5
Hairlines and dividers
Muted text#9B4B53
Captions on the surface
Accent#04C881
Second voice, not a rival
Dark variant#7A0612
Hover, pressed, headers
Light variant#FEE7E9
Selected rows, tints
Dark surface#241415
Dark-mode background
Hover#B8081C
One step down in lightness
Pressed#960717
Two steps down
Disabled#BD979C
Chroma pulled out
Focus ring#F8001B
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 #da0a21

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
  • 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.

At this chroma the association is amplified — it will dominate anything placed beside it, so give it space and use it sparingly. 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
  • EnergyHigh
  • Weight55/100
  • 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#0ADAC3
Analogous left#DA0A89
Analogous right#DA5B0A
Split-complement 1#0ADA5B
Split-complement 2#0A89DA
Triadic 1#21DA0A
Triadic 2#0A21DA
Tetradic#89DA0A
On the wheel
Base+30°−30°+120°+240°+180°353°

#da0a21 sits at 353°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red85.5%
Green3.9%
Blue12.9%
R · 0–255
218
0xda
G · 0–255
10
0x0a
B · 0–255
33
0x21

CMYK percentages

Cyan0.0%
Magenta95.4%
Yellow84.9%
Key (black)14.5%

Total ink coverage is 195%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#da0a21 text on a black background

contrast 4.05:1

Card sample

#da0a21 text on a white background

contrast 5.19:1

Card sample

#da0a21 on grey

4.74:1

#da0a21 on its own surface

4.78:1

#da0a21 on its dark surface

3.41:1

CSS3 live lab

Text font color

The quick brown fox

color: #da0a21;
Background color
Panel with #da0a21 background
background-color: #da0a21;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #da0a21;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(218, 10, 33, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(218, 10, 33, 0.45);
Border & gradient
Gradient panel
border: 3px solid #da0a21;
background: linear-gradient(135deg, #da0a21, #DA7E0A);
Gradient text

Gradient headline

background: linear-gradient(90deg, #da0a21, #DAB20A);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #da0a21;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #da0a21;
caret-color: #da0a21;
Left rule
Pull quote or callout
border-left: 4px solid #da0a21;
Ring + tint
Selected chip
background: #FEE7E9;
box-shadow: inset 0 0 0 2px #da0a21;
Conic badge
68%
background: conic-gradient(#da0a21 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #da0a21 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(218, 10, 33, 0.5)
rgb(218 10 33 / 50%)
#da0a2180
hsl(353 91% 45% / 50%)
color-mix(in srgb, #da0a21 50%, transparent)
Alpha8-digit hexFlat on white
10%#da0a211a#FBE7E9
20%#da0a2133#F8CED3
40%#da0a2166#F09DA6
60%#da0a2199#E96C7A
80%#da0a21cc#E13B4D

Gradients from #da0a21

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, #F52C42, #da0a21 45%, #7A0612);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #da0a21, #BD7C09);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #da0a21, #0ADAC3);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #F7495C 0%, #da0a21 45%, #7A0612 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%, #F522B4 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #F47B0F 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #7A0612 0%, transparent 65%), #da0a21;

Monochromatic scale

Palettes built from #da0a21

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.

#da0a21 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

Sits outside most CMYK gamuts — expect a duller press result, or specify a spot ink.

On screens

Holds up across typical panel gamma. Still worth checking on an uncalibrated laptop, where mid-tones shift most.

In dark mode

Too dim on dark surfaces at 4.05:1 — lift it to #E90B23 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.

#da0a21, answered

What color is #da0a21?

#da0a21 is a dark electric red, closest to Crimson (ΔE2000 6.4). It sits at 353° on the hue wheel with 91% saturation and 45% lightness, which reads as warm.

What is the RGB value of #da0a21?

rgb(218, 10, 33) — 218 red, 10 green and 33 blue out of 255, or 85.5% / 3.9% / 12.9% by channel.

What is #da0a21 in HSL and HSV?

hsl(353, 91%, 45%) and hsv(353, 95%, 85%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #da0a21 a light or a dark color?

It is a dark color. Relative luminance is 0.1523 and perceived brightness is 47%, so white text on it reaches 5.19:1.

Should I use black or white text on #da0a21?

White. It scores 5.19:1 against #da0a21, versus 4.05:1 for black — AA at any size.

Is #da0a21 accessible on a white background?

#da0a21 on white scores 5.19:1, which clears AA at every size but not AAA.

What is the complementary color of #da0a21?

#0ADAC3 sits directly opposite on the wheel. Softer options are the split-complements #0ADA5B and #0A89DA, which give the same contrast with far less vibration.

What colors go well with #da0a21?

For interface work: #FAF4F5 as the surface, #EDC0C5 for borders, #9B4B53 for secondary text, #04C881 as an accent and #7A0612 for hover and pressed states. For a palette, the analogous pair #DA0A89 and #DA5B0A stays calm, while #0ADAC3 is the loudest partner.

What is #da0a21 in CMYK for printing?

cmyk(0%, 95%, 85%, 15%). This is a screen-to-ink approximation — a color this saturated sits outside most CMYK gamuts and will print duller than it looks here.

Is #da0a21 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 #DA2F0A; nudged cooler, #DC086D.

Which Tailwind color is closest to #da0a21?

The red family — its 500 step is #ef4444, ΔE2000 9.5 away. That is a visible difference, so define #da0a21 as a custom token rather than reaching for the built-in.

How do I use #da0a21 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#da0a21] or text-[#da0a21], 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 #da0a21 with 50% opacity?

rgba(218, 10, 33, 0.5), or #da0a2180 in eight-digit hex. Over white that composites to #ED8590; over black, #6D0511.

Is #da0a21 a web-safe color?

No. The nearest web-safe colour is #CC0033, ΔE2000 6.7 away. The palette only matters for legacy displays and some email clients now.

What does the color #da0a21 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 #da0a21?

The safest is same-hue elevation: linear-gradient(135deg, #F52C42, #da0a21 45%, #7A0612). For more colour, a short hue run to #BD7C09 keeps it rich without turning muddy.

Work with #da0a21 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #da0a21 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.