#645A90

RGB 100, 90, 144

Values

Hex#645A90

RGB100, 90, 144

HSL251°, 23%, 46%

On White6.16:1

On Black3.41:1

#F5F5F4 background

#172013 ink

#645A90 accent

#9369B0 support

#B6B1AA neutral

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Use these colors:

Background: #F5F5F4 (background)
Ink: #172013 (ink)
Accent: #645A90 (accent)
Support: #9369B0 (support)
Neutral: #B6B1AA (neutral)

Build a design system around this color.