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#428bdf

a balanced, vivid blue · cool · closest name: dodgerblue

RGB
66, 139, 223
HSL
212°, 71%, 57%
CMYK
70, 38, 0, 13
Luminance
0.2495

Every format

HEX#428bdf
RGBrgb(66, 139, 223)
HSLhsl(212, 71%, 57%)
CMYKcmyk(70%, 38%, 0%, 13%)
LABlab(57.0 4.7 -49.4)
LCHlch(57.0 49.6 275.4)
OKLCHoklch(0.630 0.146 253.8)

Copy-ready code

/* CSS */
color: #428bdf;
background-color: #428bdf;
/* Tailwind (arbitrary) */
class="text-[#428bdf] bg-[#428bdf]"
/* SCSS */
$brand: #428bdf;
/* SwiftUI */
Color(red: 0.259, green: 0.545, blue: 0.875)
/* Android */
Color.parseColor("#428bdf")

Accessibility — WCAG contrast

Aa
#428bdf on white: 3.51:1
AA ✗ fail · AA-large · AAA
Aa
#428bdf on black: 5.99:1
AA ✓ pass · AA-large · AAA
true color
protanopia
deuteranopia
tritanopia

RGB percentages

Red25.9%
Green54.5%
Blue87.5%

CMYK percentages

Cyan70.4%
Magenta37.7%
Yellow0.0%
Key (black)12.5%

Color previews

#428bdf text on a black background

contrast 5.99:1

Card sample

#428bdf text on a white background

contrast 3.51:1

Card sample

CSS3 live lab

Text font color

The quick brown fox

color: #428bdf;
Background color
Panel with #428bdf background
background-color: #428bdf;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #428bdf;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(66, 139, 223, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(66, 139, 223, 0.45);
Border & gradient
Gradient panel
border: 3px solid #428bdf;
background: linear-gradient(135deg, #428bdf, #6242DF);

Monochromatic scale

Palettes built from #428bdf

Shades — darker

Tints — lighter

Hue & tone neighbors

Color harmonies

Nearest named colors

Work with #428bdf in the Color Lab