How to remove extra padding or margin in material design button?

android:insetBottom="0dp"

<com.google.android.material.button.MaterialButton
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:text="Edit"
        app:cornerRadius="0dp"
        android:insetBottom="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

Step 1: Put the below code in styles.xml

    <style name="myColoredButton">
        <item name="android:textColor">#FF3E96</item>
        <item name="android:padding">0dp</item>
        <item name="android:minWidth">88dp</item>
        <item name="android:minHeight">36dp</item>
        <item name="android:elevation">1dp</item>
        <item name="android:translationZ">1dp</item>
        <item name="android:background">#FF0000</item>
    </style>

Here you can change the textColor( I have used #FF3E96 above) and background color (I have used #FF0000) for your button. You can also override textColor values from your Button related layout xml by using android:colorButtonNormal.

Step 2:Create a new XML file under drawables folder and add the following code: I named my XML file as primary.xml

<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="@color/colorPrimary">
    <item>
        <shape xmlns:android="http://schemas.android.com/apk/res/android">
            <corners android:radius="1dp" />
            <solid android:color="#8B8386" />
        </shape>
    </item>
</ripple>

Step 3: Use the style and drawable in your Button as follows.

    <Button
        style="@style/myColoredButton"
        android:layout_width="250dp"
        android:layout_height="50dp"
        android:text="Cancel"
        android:gravity="center"
        android:background="@drawable/primary_round"
        android:colorButtonNormal="#3578A9" />

Hope it solves your problem.