diff --git a/OpenKeychain/src/main/res/layout-w360dp/passphrase_dialog_backup_code.xml b/OpenKeychain/src/main/res/layout-w360dp/passphrase_dialog_backup_code.xml
deleted file mode 100644
index 426616c75..000000000
--- a/OpenKeychain/src/main/res/layout-w360dp/passphrase_dialog_backup_code.xml
+++ /dev/null
@@ -1,73 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    android:orientation="vertical"
-    android:paddingBottom="14dp"
-    android:paddingTop="14dp">
-
-    <LinearLayout
-        android:id="@+id/input"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="vertical">
-
-        <TextView
-            android:id="@+id/passphrase_text"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginLeft="24dp"
-            android:text="@string/passphrase_for_backup"
-            android:textAppearance="@style/TextAppearance.AppCompat.Medium" />
-
-        <LinearLayout
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_horizontal"
-            android:layout_marginTop="8dp">
-
-            <com.github.pinball83.maskededittext.MaskedEditText
-                android:id="@+id/backup_code"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center_horizontal"
-                android:layout_marginLeft="16dp"
-                android:layout_marginRight="16dp"
-                android:textSize="16dp"
-                android:textStyle="bold"
-                android:typeface="monospace"
-                app:mask="****-****-****-****-****-****"
-                app:maskIconColor="@color/colorPrimary"
-                app:notMaskedSymbol="*"
-                tools:ignore="SpUsage" />
-
-        </LinearLayout>
-    </LinearLayout>
-
-    <LinearLayout
-        android:id="@+id/progress"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_centerInParent="true"
-        android:orientation="horizontal"
-        android:visibility="invisible">
-
-        <ProgressBar
-            style="?android:attr/progressBarStyle"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_horizontal" />
-
-        <TextView
-            style="?android:attr/textAppearanceMedium"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_vertical"
-            android:padding="4dp"
-            android:text="@string/label_unlock" />
-
-    </LinearLayout>
-
-</RelativeLayout>
\ No newline at end of file
diff --git a/OpenKeychain/src/main/res/layout-w400dp/passphrase_dialog_backup_code.xml b/OpenKeychain/src/main/res/layout-w400dp/passphrase_dialog_backup_code.xml
deleted file mode 100644
index a55033380..000000000
--- a/OpenKeychain/src/main/res/layout-w400dp/passphrase_dialog_backup_code.xml
+++ /dev/null
@@ -1,73 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    android:orientation="vertical"
-    android:paddingBottom="14dp"
-    android:paddingTop="14dp">
-
-    <LinearLayout
-        android:id="@+id/input"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="vertical">
-
-        <TextView
-            android:id="@+id/passphrase_text"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_marginLeft="24dp"
-            android:text="@string/passphrase_for_backup"
-            android:textAppearance="@style/TextAppearance.AppCompat.Medium" />
-
-        <LinearLayout
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_horizontal"
-            android:layout_marginTop="8dp">
-
-            <com.github.pinball83.maskededittext.MaskedEditText
-                android:id="@+id/backup_code"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center_horizontal"
-                android:layout_marginLeft="16dp"
-                android:layout_marginRight="16dp"
-                android:textSize="18dp"
-                android:textStyle="bold"
-                android:typeface="monospace"
-                app:mask="****-****-****-****-****-****"
-                app:maskIconColor="@color/colorPrimary"
-                app:notMaskedSymbol="*"
-                tools:ignore="SpUsage" />
-
-        </LinearLayout>
-    </LinearLayout>
-
-    <LinearLayout
-        android:id="@+id/progress"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_centerInParent="true"
-        android:orientation="horizontal"
-        android:visibility="invisible">
-
-        <ProgressBar
-            style="?android:attr/progressBarStyle"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_horizontal" />
-
-        <TextView
-            style="?android:attr/textAppearanceMedium"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center_vertical"
-            android:padding="4dp"
-            android:text="@string/label_unlock" />
-
-    </LinearLayout>
-
-</RelativeLayout>
\ No newline at end of file
diff --git a/OpenKeychain/src/main/res/layout/passphrase_dialog_backup_code.xml b/OpenKeychain/src/main/res/layout/passphrase_dialog_backup_code.xml
index ff4088b63..f18b5193e 100644
--- a/OpenKeychain/src/main/res/layout/passphrase_dialog_backup_code.xml
+++ b/OpenKeychain/src/main/res/layout/passphrase_dialog_backup_code.xml
@@ -30,12 +30,12 @@
 
             <com.github.pinball83.maskededittext.MaskedEditText
                 android:id="@+id/backup_code"
+                style="@style/BackupCodeTextStyle"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_gravity="center_horizontal"
                 android:layout_marginLeft="16dp"
                 android:layout_marginRight="16dp"
-                android:textSize="14dp"
                 android:textStyle="bold"
                 android:typeface="monospace"
                 app:mask="****-****-****-****-****-****"
diff --git a/OpenKeychain/src/main/res/values-sw360dp/styles.xml b/OpenKeychain/src/main/res/values-sw360dp/styles.xml
new file mode 100644
index 000000000..70587b7dc
--- /dev/null
+++ b/OpenKeychain/src/main/res/values-sw360dp/styles.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+
+    <!-- constrain size of backup code input for smaller devices -->
+    <style name="BackupCodeTextStyle">
+        <item name="android:textSize" tools:ignore="SpUsage">16dp</item>
+    </style>
+
+</resources>
diff --git a/OpenKeychain/src/main/res/values-sw400dp/styles.xml b/OpenKeychain/src/main/res/values-sw400dp/styles.xml
new file mode 100644
index 000000000..b18c708d9
--- /dev/null
+++ b/OpenKeychain/src/main/res/values-sw400dp/styles.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+
+    <!-- constrain size of backup code input for smaller devices -->
+    <style name="BackupCodeTextStyle">
+        <item name="android:textSize" tools:ignore="SpUsage">18dp</item>
+    </style>
+
+</resources>
diff --git a/OpenKeychain/src/main/res/values/styles.xml b/OpenKeychain/src/main/res/values/styles.xml
index 55c4e2220..5d7486d19 100644
--- a/OpenKeychain/src/main/res/values/styles.xml
+++ b/OpenKeychain/src/main/res/values/styles.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<resources>
+<resources xmlns:tools="http://schemas.android.com/tools">
 
     <style name="CardViewHeader">
         <item name="android:drawableBottom">?attr/cardViewHeaderDrawable</item>
@@ -38,4 +38,9 @@
         <item name="android:textColor">?attr/colorAccent</item>
     </style>
 
+    <!-- constrain size of backup code input for smaller devices -->
+    <style name="BackupCodeTextStyle">
+        <item name="android:textSize" tools:ignore="SpUsage">14dp</item>
+    </style>
+
 </resources>