Hyperrail/src/main/res/drawable/ruler_horizontal.xml
<?xml version="1.0" encoding="utf-8"?>
<!--
~ This Source Code Form is subject to the terms of the Mozilla Public
~ License, v. 2.0. If a copy of the MPL was not distributed with this
~ file, You can obtain one at http://mozilla.org/MPL/2.0/.
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<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@color/colorPrimary" />
<padding
android:bottom="0dp"
android:left="0dp"
android:right="0dp"
android:top="0dp" />
</shape>