#148CCC is a mid-toned, cool blue. 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 #148CCC works with other colors. Named schemes with #148CCC 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 #148CCC 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 #148CCC at work across the surfaces designers actually ship.
:root {
--color-base: #148CCC;
--color-base-rgb: 20 140 204;
--color-base-oklch: oklch(61.1% 0.136 240.3);
--color-50: #F0F9FE;
--color-100: #D9F0FC;
--color-200: #B5E0F8;
--color-300: #83C7ED;
--color-400: #55ADDD;
--color-500: #3290C3;
--color-600: #2E7094;
--color-700: #265169;
--color-800: #1D3644;
--color-900: #14222A;
--color-on-base: #141310;
}
// tailwind.config.js
colors: {
steel-blue: {
50: '#F0F9FE',
100: '#D9F0FC',
200: '#B5E0F8',
300: '#83C7ED',
400: '#55ADDD',
500: '#3290C3',
600: '#2E7094',
700: '#265169',
800: '#1D3644',
900: '#14222A',
},
}
$base: #148CCC; $base-ink: #141310; $base-50: #F0F9FE; $base-100: #D9F0FC; $base-200: #B5E0F8; $base-300: #83C7ED; $base-400: #55ADDD; $base-500: #3290C3; $base-600: #2E7094; $base-700: #265169; $base-800: #1D3644; $base-900: #14222A; $base-hover: #1070A3; $base-subtle: #B9DCEF;
{
"color": {
"base": {
"value": "#148CCC",
"type": "color"
},
"onBase": {
"value": "#141310",
"type": "color"
},
"scale": {
"50": {
"value": "#F0F9FE",
"type": "color"
},
"100": {
"value": "#D9F0FC",
"type": "color"
},
"200": {
"value": "#B5E0F8",
"type": "color"
},
"300": {
"value": "#83C7ED",
"type": "color"
},
"400": {
"value": "#55ADDD",
"type": "color"
},
"500": {
"value": "#3290C3",
"type": "color"
},
"600": {
"value": "#2E7094",
"type": "color"
},
"700": {
"value": "#265169",
"type": "color"
},
"800": {
"value": "#1D3644",
"type": "color"
},
"900": {
"value": "#14222A",
"type": "color"
}
}
}
}