update demo page (#1585)

bltcn

2024-04-03 c1a492a96e6d78ea4dbad63a51aa9065780e1287

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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#512BD4</color>
    <color name="colorPrimaryDark">#2B0B98</color>
    <color name="colorAccent">#2B0B98</color>
</resources>