Closest to Steel Blue
#3778BF
Color conversions
Reference values for common CSS, design, and accessibility formats.
| Format | Value | Preview | Copy |
|---|---|---|---|
| HEX | 3778BF | ||
| HEX with # | #3778BF | ||
| RGB | rgb(55, 120, 191) | ||
| RGBA | rgba(55, 120, 191, 1) | ||
| HSL | hsl(211.32 55.28% 48.24%) | ||
| HSLA | hsla(211.32, 55.28%, 48.24%, 1) | ||
| HSV | hsv(211.32, 71.2%, 74.9%) | ||
| CMYK | cmyk(71.2%, 37.17%, 0%, 25.1%) | ||
| OKLCH | oklch(56.49% 0.1288 252.79) |
Closest named matches
Color modifications
Lighter shades
Saturation steps
Suggested pairings
Split-complementary
Try this combo as a gradientUse this color in CSS
--color: #3778BF;
bg-[#3778bf]
Accessibility quick-check
White text
4.56:1
AA normal
Black text
4.6:1
AA normal
Reference notes
#3778BF is a balanced, clear blue color closest to Steel Blue. The color has RGB channels of 55, 120, and 191; in HSL terms, it is centered near 211 degrees with 55% saturation and 48% lightness. In a design system, this cool reading is a useful shortcut for deciding whether the color should act as a primary accent, a supporting surface, or a quiet divider. The safest usage pattern is to test it against both light and dark surfaces, then reserve the weaker text pairing for decoration rather than essential labels. If the color feels too forceful at full strength, the lighter, darker, and desaturated variants usually provide a calmer path for production UI. For editorial or product interfaces, reserve the most saturated use for accents and repeat softer variants in borders, labels, or background fills. This makes it useful for backgrounds, supporting UI surfaces, editorial layouts, and restrained visual systems. In CSS systems, define it as a custom property first so variations, shadows, and gradients can stay consistent.