Signal-Android/app/src/main/res/drawable/info_round.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape>
            <corners android:radius="2dp" />
            <solid android:color="#ff145c95" />
        </shape>
    </item>

    <item>
        <shape>
            <corners android:radius="2dp" />
            <solid android:color="@color/core_ultramarine" />
        </shape>
    </item>
</selector>