layout_margin in CardView is not working properly

I am playing with the new CardView, but the margins don't seem to be applying. ``` <?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:card_view="http://schemas.android.com/apk/res-auto" android:id="@+id/card_view" android:layout_gravity="center" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="18dp" android:layout_marginLeft="18dp" android:layout_marginRight="18dp" card_view:cardCornerRadius="4dp" card_view:cardBackgroundColor="#FFA" card_view:layout_margind="4dp"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/info_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!"/> </LinearLayout> </android.support.v7.widget.CardView> ``` By the way, I'm using it in a Fragment that is in a ViewPager. The card extends the entire width of the screen (match_parent) even though I am using `android:layout_marginLeft="18dp"` and `android:layout_marginRight="18dp"` on the CardView. Any ideas what I might be doing wrong?