android-calculatorpp/android-app/src/main/res/drawable/blue_button_shape.xml

<?xml version="1.0" encoding="utf-8"?>

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<shape xmlns:a="http://schemas.android.com/apk/res/android">
	<gradient
			a:startColor="#001c45"
			a:endColor="#003481"
			a:angle="90"/>
	<corners a:radius="0dp"/>
</shape>