Fix: Align horizontal timeline items and anchor button vertically to parent center

android-project/app/src/main/res/layout/activity_main.xml

@@ -117,7 +117,8 @@
         <androidx.recyclerview.widget.RecyclerView
             android:id="@+id/rvHorizontalTimeline"
             android:layout_width="match_parent"
-            android:layout_height="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
             android:orientation="horizontal"
             android:clipToPadding="false"
             android:paddingStart="75dp"