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Running Number
9,110,275
HEX
#8B0303
RGB
139, 3, 3
HSL
0°,96%,28%
HSV
0°,98%,55%
CMYK
0%,98%,98%,45%
Brightness
17%
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
#8B0303 sits at 0° on the color wheel, placing it in the red family of the warm half of the spectrum. With 96% saturation and 28% lightness, it reads as a fully saturated, shadowed tone — a weighted, dramatic presence with deep undertones. Its RGB mix of 139, 3, 3 produces a 9.94:1 contrast ratio against white, which clears WCAG AAA for body text in that pairing.
In RGB space #8B0303 is a close cousin of CSS maroon — about 12 units away from #800000. Designers reach for red hues at this saturation when the brief calls for bold, immediate signal, and at this lightness when they want weight, depth, and grounded contrast. 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 #8B0303 in different programming languages
| Platform | Languages |
|---|---|
| Frontend | |
| Mobile | |
| Backend | |
| Others |
document.getElementById("box").style.backgroundColor = "#8b0303";💡 Click any tab to see how to use #8b0303 in different programming languages