#645EA1

RGB 100, 94, 161

Values

Hex#645EA1

RGB100, 94, 161

HSL245°, 26%, 50%

On White5.74:1

On Black3.66:1

#F3F4F1 background

#24351D ink

#645EA1 accent

#77599B support

#AAA5A1 neutral

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Use these colors:

Background: #F3F4F1 (background)
Ink: #24351D (ink)
Accent: #645EA1 (accent)
Support: #77599B (support)
Neutral: #AAA5A1 (neutral)

Build a design system around this color.