CSS named colour

Yellow

#ffff00

A CSS named colour: yellow is valid anywhere a colour is expected.

RGB: rgb(255 255 0)
HSL: 60°, 100%, 50%
OKLCh: 96.8% 0.211 109.8

Yellow in every format

Web & CSSThe everyday formats for stylesheets and design tools.

Hex	`#ffff00`
RGB	`rgb(255 255 0)`
RGB legacy	`rgb(255, 255, 0)`
RGB percent	`rgb(100% 100% 0%)`
HSL	`hsl(60 100% 50%)`
HSL legacy	`hsl(60, 100%, 50%)`
HSV / HSB	`hsv(60, 100%, 100%)`
HWB	`hwb(60 0% 0%)`
Nearest name	`yellow`
CMYK	`cmyk(0%, 0%, 100%, 0%)`Naive conversion. Real print work needs an ICC profile.

Perceptual & wide gamutModern CSS colour spaces for uniform scales and P3 displays.

OKLCh	`oklch(96.798% 0.21101 109.769)`Modern CSS colour space for even palettes — better than HSL when building scales.
OKLab	`oklab(96.798% -0.07137 0.19857)`
CIE LCh	`lch(97.607% 94.712 99.572)`
CIE Lab	`lab(97.607% -15.75 93.394)`
Display P3	`color(display-p3 1 1 0.3309)`
Rec. 2020	`color(rec2020 0.9783 0.9944 0.2984)`
srgb-linear	`color(srgb-linear 1 1 0)`Light-linear sRGB — the same numbers a shader wants for maths.
CIE XYZ (D65)	`color(xyz-d65 0.77 0.9278 0.1385)`

ShadersGLSL, HLSL and WGSL vectors in both encoded and linear form.

GLSL vec3 — sRGB	`vec3(1.0, 1.0, 0.0)`Encoded values. Use when writing straight to the framebuffer.
GLSL vec3 — linear	`vec3(1.0, 1.0, 0.0)`Light-linear values. Use for lighting, blending and mixing.
GLSL vec4 — sRGB	`vec4(1.0, 1.0, 0.0, 1.0)`
GLSL vec4 — linear	`vec4(1.0, 1.0, 0.0, 1.0)`
GLSL ivec3	`ivec3(255, 255, 0)`
HLSL float3 — sRGB	`float3(1.0, 1.0, 0.0)`
HLSL float3 — linear	`float3(1.0, 1.0, 0.0)`
HLSL float4 — sRGB	`float4(1.0, 1.0, 0.0, 1.0)`
HLSL half4 — sRGB	`half4(1.0, 1.0, 0.0, 1.0)`
WGSL vec3f — sRGB	`vec3f(1.0, 1.0, 0.0)`
WGSL vec4f — sRGB	`vec4f(1.0, 1.0, 0.0, 1.0)`
WGSL vec3<f32> — linear	`vec3<f32>(1.0, 1.0, 0.0)`

Engines & appsConstructors for Unity, Unreal, Godot, Flutter, SwiftUI and Android.

Unity Color	`new Color(1.0f, 1.0f, 0.0f, 1.0f)`Color for everyday scripting (0–1). Color32 when you need whole numbers from 0 to 255.
Unity Color32	`new Color32(255, 255, 0, 255)`
Unreal FLinearColor	`FLinearColor(1.0f, 1.0f, 0.0f, 1.0f)`FLinearColor for materials and lighting. FColor when you need whole numbers from 0 to 255.
Unreal FColor	`FColor(255, 255, 0, 255)`Whole numbers from 0 to 255 — use when an API asks for FColor, not FLinearColor.
Godot Color	`Color(1, 1, 0, 1)`
Flutter Color	`Color(0xFFFFFF00)`Packed ARGB, so alpha comes first.
Android Color	`Color.rgb(255, 255, 0)`
SwiftUI Color	`Color(red: 1, green: 1, blue: 0)`
UIKit UIColor	`UIColor(red: 1, green: 1, blue: 0, alpha: 1)`

Raw valuesPacked integers and plain arrays.

0x hex	`0xFFFF00`
0x hex (ARGB)	`0xFFFFFF00`
Array 0–1	`[1, 1, 0]`
Array 0–255	`[255, 255, 0]`
Decimal integer	`16776960`

Contrast and accessibility

WCAG 2 ratios are what audits and legislation reference. APCA is shown alongside because WCAG 2 is known to misjudge mid-tone backgrounds, and it is the basis of the WCAG 3 draft.

Pairing	WCAG 2 ratio	Level	APCA	Suitable for
Yellow on white	1.07:1	Fail	Lc 0	Not usable for text
Yellow on black	19.56:1	AAA	Lc 103	Body text at any size

Yellow text on a white background

Yellow text on a black background

White text on Yellow

Black text on Yellow

Tonal scale

Hue held fixed while lightness walks OKLCh, ready to use as a design system ramp.

50#feff79
100#f5f766
200#e5e540
300#cfce00
400#b2b100
500#939200
600#787700
700#605f00
800#4c4b00
900#3c3b00
950#222100

Tints and shades

Mixed perceptually toward white and black, so the steps feel evenly spaced.

Tint 1#feff61
Tint 2#feff8b
Tint 3#feffac
Tint 4#feffca
Tint 5#feffe5
Shade 1#c8c800
Shade 2#949400
Shade 3#636300
Shade 4#363600
Shade 5#0f0f00

Colours that work with Yellow

Complementary, triadic and analogous partners, rotated in OKLCh so they keep the same apparent brightness.

#f3f1ff
#d7fbff
#ffe9f9
#fff0c1
#d0ffc3

Closest CSS names

yellowexact match
greenyellowΔEok 0.098
goldΔEok 0.099
khakiΔEok 0.115
palegreenΔEok 0.136
palegoldenrodΔEok 0.140