#4282BB is a mid-toned, cool indigo. On the Color Lab it reads clean and engineered. It carries a legible label as a UI accent and sits well as a supporting tone.
Not just a swatch — here's how #4282BB works with other colors. Named schemes with #4282BB in its natural role, and a note on why the supporting colors balance it.
Steel Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.
Steel Blue is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Steel Blue.
Steel Blue plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.
Steel Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.
Steel Blue is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Steel Blue carrying the quiet middle.
How #4282BB actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.
Not a swatch to memorise — a color to build with. Here is #4282BB at work across the surfaces designers actually ship.
:root {
--color-base: #4282BB;
--color-base-rgb: 66 130 187;
--color-base-oklch: oklch(59.0% 0.110 247.7);
--color-50: #F3F8FB;
--color-100: #E0EBF5;
--color-200: #C3D8EA;
--color-300: #99BAD7;
--color-400: #719CC1;
--color-500: #507DA5;
--color-600: #43637F;
--color-700: #34495B;
--color-800: #25313C;
--color-900: #181F25;
--color-on-base: #141310;
}
// tailwind.config.js
colors: {
steel-blue: {
50: '#F3F8FB',
100: '#E0EBF5',
200: '#C3D8EA',
300: '#99BAD7',
400: '#719CC1',
500: '#507DA5',
600: '#43637F',
700: '#34495B',
800: '#25313C',
900: '#181F25',
},
}
$base: #4282BB; $base-ink: #141310; $base-50: #F3F8FB; $base-100: #E0EBF5; $base-200: #C3D8EA; $base-300: #99BAD7; $base-400: #719CC1; $base-500: #507DA5; $base-600: #43637F; $base-700: #34495B; $base-800: #25313C; $base-900: #181F25; $base-hover: #356997; $base-subtle: #CBDAE7;
{
"color": {
"base": {
"value": "#4282BB",
"type": "color"
},
"onBase": {
"value": "#141310",
"type": "color"
},
"scale": {
"50": {
"value": "#F3F8FB",
"type": "color"
},
"100": {
"value": "#E0EBF5",
"type": "color"
},
"200": {
"value": "#C3D8EA",
"type": "color"
},
"300": {
"value": "#99BAD7",
"type": "color"
},
"400": {
"value": "#719CC1",
"type": "color"
},
"500": {
"value": "#507DA5",
"type": "color"
},
"600": {
"value": "#43637F",
"type": "color"
},
"700": {
"value": "#34495B",
"type": "color"
},
"800": {
"value": "#25313C",
"type": "color"
},
"900": {
"value": "#181F25",
"type": "color"
}
}
}
}