#3C628E
#8CBEDC
#EDF6F9
#C5A85B
#221E3FSpace
#5D79BBSteel Blue
#DCA515Mustard
#FFF3E0Buttercream
Sunny Mustard & Steel Blue is a vivid complementary color palette tagged modern, blue, yellow. Near-complementary hues (about 179° apart) make this a high-contrast, attention-grabbing combination. Saturation runs high, so use the brightest color sparingly and let the others carry the surface area. Warm and cool hues are mixed, which adds depth.
Color codes click any value to copy
| Swatch | Name | HEX | RGB | HSL | OKLCH |
|---|---|---|---|---|---|
| Space | #221E3F | rgb(34, 30, 63) | hsl(247, 35%, 18%) | oklch(25.8% 0.061 287) | |
| Steel Blue | #5D79BB | rgb(93, 121, 187) | hsl(222, 41%, 55%) | oklch(58.4% 0.107 266) | |
| Mustard | #DCA515 | rgb(220, 165, 21) | hsl(43, 83%, 47%) | oklch(75.3% 0.151 84) | |
| Buttercream | #FFF3E0 | rgb(255, 243, 224) | hsl(37, 100%, 94%) | oklch(96.9% 0.028 79) |
Why it works and how to use it
The palette holds together thanks to its complementary hue relationship and a strong light-to-dark ladder (94% down to 18% lightness). A natural fit for websites, presentations and branding.
- Background: Buttercream (#FFF3E0) is the lightest color, so it belongs on large surfaces.
- Text: Space (#221E3F) on #FFF3E0 gives 14.45:1, passing WCAG AAA.
- Primary: Mustard (#DCA515) is the most saturated mid-tone; use it for buttons and links with a border or a darker shade for contrast.
- Accent: Steel Blue (#5D79BB) for highlights, badges and hover states.
2 of 6 color pairs pass WCAG AA (4.5:1); the strongest is Space on Buttercream at 14.45:1.
Preview on a real UI see how the palette feels in context
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Design faster with Sunny Mustard & Steel Blue
A palette preview that turns four colors into a page, so you can judge hierarchy, contrast and mood before you commit.
Primary action SecondaryCard title
Card title
Card title
Roles are assigned by lightness.
Color blindness simulation
#221E3F
#5D79BB
#DCA515
#FFF3E0
Color-blind check: all four colors stay distinguishable under protanopia, deuteranopia and tritanopia.
Contrast check WCAG ratios between palette colors
| Pair | Sample | Ratio | Level |
|---|---|---|---|
#221E3F on #FFF3E0 | Aa | 14.45:1 | AAA |
#221E3F on #DCA515 | Aa | 7.12:1 | AAA |
#5D79BB on #FFF3E0 | Aa | 3.89:1 | AA large only |
#221E3F on #5D79BB | Aa | 3.71:1 | AA large only |
#DCA515 on #FFF3E0 | Aa | 2.03:1 | Fail |
#5D79BB on #DCA515 | Aa | 1.92:1 | Fail |
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