Login screens: add background color

vector/src/main/res/layout/fragment_login.xml

@@ -4,7 +4,8 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/login_fragment"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_captcha.xml

@@ -3,7 +3,8 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_generic_text_input_form.xml

@@ -4,7 +4,8 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/login_fragment"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_reset_password.xml

@@ -3,7 +3,8 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_reset_password_mail_confirmation.xml

@@ -2,7 +2,8 @@
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_reset_password_success.xml

@@ -2,7 +2,8 @@
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_server_selection.xml

@@ -3,7 +3,8 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_server_url_form.xml

@@ -4,7 +4,8 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/login_fragment"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_signup_signin_selection.xml

@@ -3,7 +3,8 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_splash.xml

@@ -2,7 +2,8 @@
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <androidx.core.widget.NestedScrollView
         android:layout_width="match_parent"

vector/src/main/res/layout/fragment_login_terms.xml

@@ -3,7 +3,8 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_wait_for_email.xml

@@ -3,7 +3,8 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/login_fragment"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:background="?riotx_background">
 
     <!-- Missing attributes are in the style -->
     <ImageView

vector/src/main/res/layout/fragment_login_web.xml

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="?riotx_background"
     android:orientation="vertical">
 
     <androidx.appcompat.widget.Toolbar