#E4EFFB is a light neutral with only a whisper of temperate cast. On the Color Lab it reads clean and engineered, restrained and easy to live with. It holds up as a large surface and is too pale to lead as a primary accent.
Not just a swatch — here's how #E4EFFB works with other colors. Named schemes with #E4EFFB in its natural role, and a note on why the supporting colors balance it.
Cool White keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.
Cool White opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.
Cool White is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Cool White.
Cool White sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.
Cool White 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 Cool White carrying the quiet middle.
How #E4EFFB 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 #E4EFFB at work across the surfaces designers actually ship.
:root {
--color-base: #E4EFFB;
--color-base-rgb: 228 239 251;
--color-base-oklch: oklch(94.7% 0.020 250.4);
--color-50: #F1F7FE;
--color-100: #DBEAFB;
--color-200: #B8D5F4;
--color-300: #88B6E7;
--color-400: #5C97D6;
--color-500: #3978BC;
--color-600: #335F8F;
--color-700: #2A4665;
--color-800: #1F3042;
--color-900: #151E29;
--color-on-base: #141310;
}
// tailwind.config.js
colors: {
cool-white: {
50: '#F1F7FE',
100: '#DBEAFB',
200: '#B8D5F4',
300: '#88B6E7',
400: '#5C97D6',
500: '#3978BC',
600: '#335F8F',
700: '#2A4665',
800: '#1F3042',
900: '#151E29',
},
}
$base: #E4EFFB; $base-ink: #141310; $base-50: #F1F7FE; $base-100: #DBEAFB; $base-200: #B8D5F4; $base-300: #88B6E7; $base-400: #5C97D6; $base-500: #3978BC; $base-600: #335F8F; $base-700: #2A4665; $base-800: #1F3042; $base-900: #151E29; $base-hover: #91BEEF; $base-subtle: #F8FAFD;
{
"color": {
"base": {
"value": "#E4EFFB",
"type": "color"
},
"onBase": {
"value": "#141310",
"type": "color"
},
"scale": {
"50": {
"value": "#F1F7FE",
"type": "color"
},
"100": {
"value": "#DBEAFB",
"type": "color"
},
"200": {
"value": "#B8D5F4",
"type": "color"
},
"300": {
"value": "#88B6E7",
"type": "color"
},
"400": {
"value": "#5C97D6",
"type": "color"
},
"500": {
"value": "#3978BC",
"type": "color"
},
"600": {
"value": "#335F8F",
"type": "color"
},
"700": {
"value": "#2A4665",
"type": "color"
},
"800": {
"value": "#1F3042",
"type": "color"
},
"900": {
"value": "#151E29",
"type": "color"
}
}
}
}