#645EA1

RGB 100, 94, 161

Values

Hex#645EA1

RGB100, 94, 161

HSL245°, 26%, 50%

On White5.74:1

On Black3.66:1

#F0F0EF background

#253319 ink

#645EA1 accent

#76369B support

#C5BCA6 neutral

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Use these colors:

Background: #F0F0EF (background)
Ink: #253319 (ink)
Accent: #645EA1 (accent)
Support: #76369B (support)
Neutral: #C5BCA6 (neutral)

Build a design system around this color.