#3F577D

RGB 63, 87, 125

Values

Hex#3F577D

RGB63, 87, 125

HSL217°, 33%, 37%

On White7.32:1

On Black2.87:1

#EFEEEB background

#202414 ink

#3F577D accent

#5E36C4 support

#B89C99 neutral

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Use these colors:

Background: #EFEEEB (background)
Ink: #202414 (ink)
Accent: #3F577D (accent)
Support: #5E36C4 (support)
Neutral: #B89C99 (neutral)

Build a design system around this color.