Signal-Android/app/src/main/res/layout/conversation_activity_unmute.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/signal_colorSurface2">

    <com.google.android.material.button.MaterialButton
        android:id="@+id/conversation_activity_unmute_button"
        style="@style/Signal.Widget.Button.Large.Secondary"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minHeight="60dp"
        android:text="@string/conversation_muted__unmute" />

</FrameLayout>