Fix keyboard size

app/src/main/res/layout/input.xml

@@ -3,7 +3,8 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:maxHeight="664px"
+    android:minHeight="@dimen/keyboard_min_height"
+    android:maxHeight="@dimen/keyboard_max_height"
     tools:context=".ui.MainActivity"
     android:background="@color/inputBackground">
 

app/src/main/res/values/dimens.xml

@@ -2,4 +2,6 @@
 <resources>
     <dimen name="keyboard_key_height">32dp</dimen>
     <dimen name="big_icon_height">64dp</dimen>
+    <dimen name="keyboard_min_height">375px</dimen>
+    <dimen name="keyboard_max_height">664px</dimen>
 </resources>