Steel Blue Color Palette
Steel Blue is hex #4682B4, rgb(70, 130, 180). Steel blue is a medium grey-blue, like tempered steel. It is a CSS named color and a solid, low-drama choice for business interfaces.
By Mohamed Farhan · Updated Oct 19, 2026
Steel Blue color codes
Reading the steel blue color codes
The hex code #4682B4 is three pairs of base-16 numbers for red, green and blue. 46 is 70, 82 is 130 and B4 is 180, each on a scale from 0 to 255. That is why the same color is written rgb(70, 130, 180) in CSS. The blue channel is the strongest here, which is what gives steel blue its blue character.
HSL describes the same color the way people think about it. A hue of 207 degrees places steel blue in the blue part of the color wheel. Saturation of 44% makes it moderately saturated, and lightness of 49% makes it a mid-tone color. HSL is the easiest format to adjust by hand: keep the hue, then raise or lower lightness to create tints and shades that stay in the same family.
For print, the approximate CMYK mix is 61% cyan, 28% magenta, 0% yellow and 29% black. Screen and print colors never match perfectly, because monitors emit light while ink absorbs it, so always proof a printed sample before committing to steel blue for packaging or stationery. See MDN's guide to CSS color values for every format browsers accept.
Steel Blue shades and tints
A full 50 to 950 scale built around #4682B4, so you can use steel blue for backgrounds, borders, buttons and text without leaving the family. Click any shade to copy it.
// tailwind.config.js
theme: {
extend: {
colors: {
"steel-blue": {
50: "#DEE9F2",
100: "#C5D8E7",
200: "#ABC7DD",
300: "#92B5D3",
400: "#79A4C9",
500: "#5F93BE",
600: "#4682B4",
700: "#3B6D97",
800: "#30587A",
900: "#24435D",
950: "#192E40",
},
},
},
}:root {
--steel-blue-50: #DEE9F2;
--steel-blue-100: #C5D8E7;
--steel-blue-200: #ABC7DD;
--steel-blue-300: #92B5D3;
--steel-blue-400: #79A4C9;
--steel-blue-500: #5F93BE;
--steel-blue-600: #4682B4;
--steel-blue-700: #3B6D97;
--steel-blue-800: #30587A;
--steel-blue-900: #24435D;
--steel-blue-950: #192E40;
}A shade-by-shade guide to steel blue
The 50 to 950 scale above follows the same structure as Tailwind's built-in palettes, so each step has a natural job. The lightest steps, 50 (#DEE9F2) and 100 (#C5D8E7), are page and card backgrounds: they carry the steel blue mood without competing with content. Steps 200 (#ABC7DD) and 300 (#92B5D3) suit borders, dividers, hover states and selected rows.
The middle of the scale, 400 to 600, is where steel blue is most recognizable, so use it for brand moments, illustrations and primary buttons. White text reaches the 4.5:1 body-text contrast minimum from step 700 upward, so use step 700 or darker when a button label needs to be white. Near-black text stays readable on steps 50 to 600.
The darkest steps, 800 (#30587A) through 950 (#192E40), make headings, body text and dark-mode surfaces that stay clearly related to steel blue. Using step 900 or 950 for text instead of pure black is one of the simplest ways to make an interface feel designed rather than default.
Colors that go with steel blue
How the steel blue color combinations work
Complementary. Directly across the color wheel from steel blue is #B47846, which sits closest to copper among common named colors. Complementary pairs create the strongest contrast of hue, so use the second color sparingly, for a single call to action or highlight, rather than in equal amounts.
Analogous. #46B4AF and #464BB4 sit 30 degrees either side of steel blue. Analogous palettes feel calm and cohesive because the colors share undertones; they are ideal for illustrations, gradients and backgrounds where you want harmony more than contrast.
Triadic and split complementary. The triadic set (#B44682 and #82B446) is evenly spaced around the wheel and feels playful; the second color is closest to plum. The split complementary set (#B4464B and #B4AF46) keeps much of the complementary contrast but is easier to balance, which makes it a good choice for data visualization and multi-category tags.
Monochromatic. The monochromatic set runs from #B2CCE1 to #1E384D. A single-hue palette is the safest way to build a calm, premium interface: rely on lightness for hierarchy, then add one neutral and one accent if you need emphasis.
Steel Blue compared with similar colors
royal blue (#4169E1) is lighter (57% vs 49% lightness) and more saturated, and leans further around the wheel toward blue. Choose royal blue if you want a softer, airier version; choose steel blue if you want its specific balance of brightness and color.
zomp (#39A78E) is darker (44% vs 49% lightness) and more saturated, and leans back the wheel toward teal-green. Choose zomp if you need more weight and contrast; choose steel blue if you want its specific balance of brightness and color.
slate grey (#708090) is about as light and more muted, and shares almost the same hue. Choose slate grey if you want a softer, airier version; choose steel blue if you want its specific balance of brightness and color.
Steel Blue in a real interface
Swatches only tell half the story. Here steel blue carries the primary action, with tints from its own scale for the surface and panels.
Weekly summary
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Using steel blue in UI: buttons, text, backgrounds and dark mode
- Buttons. White labels on steel blue reach 4.11:1, enough for large or bold text only. For regular button labels, use step 700 or switch to dark text.
- Text. Avoid steel blue for body text on white; use step 700 or darker for links and headings that need to read as steel blue.
- Backgrounds. Use steps 50 and 100 for large areas and keep the base color for smaller surfaces. Big blocks of a moderately saturated mid-tone color draw attention, so give them a reason, like a hero section or pricing highlight.
- Dark mode. Steps 900 and 950 make a dark surface tinted with steel blue. On dark backgrounds the base color often needs a lighter step (300 or 400) to keep enough contrast for icons and borders, as required by WCAG non-text contrast.
- States. Shift one step darker for hover and two steps darker for pressed. Keep focus rings in a contrasting color so keyboard users can always see them.
Contrast and accessibility
AA needs 4.5:1 for body text and 3:1 for large text. AAA needs 7:1.
Color contrast is measured as a ratio from 1:1 (no contrast) to 21:1 (black on white). Steel Blue scores 4.11:1 against white (AA large) and 5.11:1 against black (AA). The WCAG 2.1 contrast guideline asks for at least 4.5:1 for normal text and 3:1 for large text, which is why the shade guide above recommends specific steps for text and labels.
Contrast is only half of accessibility. Around 1 in 12 men and 1 in 200 women have some form of color vision deficiency, so never use steel blue alone to signal meaning such as success, error or selection. Pair it with an icon, a label or a change in weight.
What steel blue means
Blue is the most trusted color in digital products. It signals stability, competence and calm, which is why banks, SaaS tools and health platforms default to it.
Steel blue describes the grey-blue sheen of tempered steel. It is one of the CSS named colors and a dependable, understated blue.
Because so many products already use blue, the shade matters more than the hue. Pair it with an unexpected neutral or accent so the interface does not look like every other dashboard.
Where steel blue works best
- Corporate and B2B
- Engineering and manufacturing
- Data visualisation
- Dashboards
How to style steel blue
Steel blue pairs with white, amber, slate and charcoal. It supports white text at larger sizes. Use it for corporate, engineering and data products.
Build a UI with steel blue
Inspo AI generates a full React + Tailwind screen using #4682B4 as the brand color, grounded in real shipped designs.
Sources and further reading
- Wikipedia: Steel Blue · History and definition of steel blue.
- WCAG 2.1: Contrast (Minimum) · The W3C rule behind the 4.5:1 and 3:1 thresholds used on this page.
- WCAG 2.1: Use of Color · Why color should never be the only way information is shown.
- MDN: CSS color values · Reference for hex, rgb() and hsl() syntax.
- Tailwind CSS: Customizing colors · How to add a custom color scale to your theme.
Similar colors
Questions people ask
What is the hex code for steel blue?
The hex code for steel blue used on this page is #4682B4. In RGB that is rgb(70, 130, 180), and in HSL it is hsl(207, 44%, 49%).
What colors go well with steel blue?
Steel Blue pairs well with #284B63, #F1F6FA, #D9DCDF (the Foundry Floor palette above). Its complementary color is #B47846, and analogous colors are #46B4AF and #464BB4.
Is steel blue a warm or cool color?
Steel Blue is a cool color. Its hue sits at 207 degrees on the color wheel with 44% saturation.
Can I use steel blue for text?
Steel Blue has a contrast ratio of 4.11:1 against white and 5.11:1 against black. Body text needs at least 4.5:1, so it works as a background behind dark text, but not as text on white.
What does steel blue mean?
Blue is the most trusted color in digital products. It signals stability, competence and calm, which is why banks, SaaS tools and health platforms default to it. Steel Blue in particular is used for corporate and b2b and engineering and manufacturing.
How do I use steel blue in Tailwind CSS?
Use an arbitrary value like bg-[#4682B4] for a one-off, or add the 50-950 scale from this page to theme.extend.colors in tailwind.config.js and use classes like bg-steel-blue-500 and text-steel-blue-900.
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