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💡 Click on any color value below to copy it to clipboard
Running Number
11,799,307
HEX
#B40B0B
RGB
180, 11, 11
HSL
0°,88%,37%
HSV
0°,94%,71%
CMYK
0%,94%,94%,29%
Brightness
24%
Type
Dark
AA Normal Text: ≥ 4.5:1
AA Large Text: ≥ 3.0:1
AAA Normal Text: ≥ 7.0:1
AAA Large Text: ≥ 4.5:1
#B40B0B sits at 0° on the color wheel, placing it in the red family of the warm half of the spectrum. With 88% saturation and 37% lightness, it reads as a fully saturated, shadowed tone — an immediate, signal-grade voice that demands attention. Its RGB mix of 180, 11, 11 produces a 7.02:1 contrast ratio against white, which clears WCAG AAA for body text in that pairing.
In RGB space #B40B0B is a clear variant of CSS firebrick — about 33 units away from #B22222. Designers reach for red hues at this saturation when the brief calls for bold, immediate signal, and at this lightness when they want a present, comfortable mid-canvas voice. On screen the warm cast tends to pair best with cool neutrals around 210°-230° to balance temperature.
See how this color appears in real UI elements
Button (filled)
Badge
Progress Bar
Link Hover
Input Focus Ring
Checkbox Active
Toggle Switch On
Slider Thumb
Card Border
Icon Highlight
Tooltip Background
Modal Header
Tab Active
Alert Box
Timeline Dot
Loading Spinner
Dropdown Selected
Table Row Highlight
Calendar Date
Mobile Device
See how to use #B40B0B in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#b40b0b";💡 Click any tab to see how to use #b40b0b in different programming languages