CardView and RecyclerView divider behaviour

I am trying to use RecyclerView with CardView as an single item of the list.
I want to implement horizontal list, with LayoutManager it is really easy.
So I started to implement it. It seems that everything works, but not as I expected here is the result using CardView as an list item.

http://ift.tt/1FMdRla

Looks pretty good, but I haven't set any paddings, dividers and rounded corners.
Here is my XML for card view item.

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <RelativeLayout
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_gravity="center"
        android:gravity="center"
       >
        <ImageView
            android:id="@+id/image_view"
            android:src="@drawable/androidsss"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_alignParentTop="true"
            android:layout_centerInParent="true"
            />
        <TextView
            android:id="@+id/info_text"
            android:layout_below="@+id/image_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:ellipsize="end"
            android:singleLine="true"
            android:textColor="@android:color/black"
            android:textSize="14sp" />
    </RelativeLayout>

</android.support.v7.widget.CardView>

Also there is something like small divider at the bottom of layout.
I haven't specified any.
Here is my setting up code for RecyclerView

 mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
    mRecyclerView.setHasFixedSize(true);
    mLayoutManager = new LinearLayoutManager(this);
    mLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
    mRecyclerView.setLayoutManager(mLayoutManager);
 //   mRecyclerView.addItemDecoration(new SimpleDividerItemDecoration(this));
    mAdapter = new CardViewDataAdapter(myDataset);
    mRecyclerView.setAdapter(mAdapter);

Interesting thing that with simple item, not card view, everything works as expected. Here is an example.

http://ift.tt/1Hq3NZW

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
    android:orientation="vertical" android:layout_width="150dp"
    android:layout_height="100dp"
    android:background="@android:color/white"
    >

    <ImageView
        android:id="@+id/item_image"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_alignParentLeft="true"
        android:layout_centerInParent="true"
        />
    <TextView
        android:id="@+id/item_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/item_image"
        android:text="Hello World !!"
        android:layout_centerInParent="true"
        android:textColor="@android:color/black"
        />
</RelativeLayout>

Where is the problem, is it my fault or bug ?