Scroll handle was half as opaque as it was supposed to be

<shape xmlns:android="http://schemas.android.com/apk/res/android"

       android:tint="?attr/colorControlNormal"

       android:shape="rectangle">

    <solid android:color="#42ffffff" />

    <solid android:color="#84ffffff" />

    <size android:width="4dp" />

</shape>