#639C99

RGB 99, 156, 153

Values

Hex#639C99

RGB99, 156, 153

HSL177°, 22%, 50%

On White3.11:1

On Black6.75:1

#F4F1F1 background

#3B291C ink

#639C99 accent

#5A7281 support

#CECACB neutral

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Use these colors:

Background: #F4F1F1 (background)
Ink: #3B291C (ink)
Accent: #639C99 (accent)
Support: #5A7281 (support)
Neutral: #CECACB (neutral)

Build a design system around this color.