Remove unnecessary styles

Author: MarkNjunge

app/src/main/res/values-v21/styles.xml

@@ -6,6 +6,7 @@
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
         <item name="android:windowActionBarOverlay">true</item>
+        <item name="android:windowContentTransitions">true</item>
     </style>
 
     <style name="SplashTheme" parent="Theme.AppCompat.Light.NoActionBar">
@@ -36,8 +37,9 @@
     </style>
 
     <style name="button_primary">
-        <item name="android:colorBackground">@color/colorAccent</item>
+        <item name="android:backgroundTint">@color/colorAccent</item>
         <item name="android:textColor">@android:color/white</item>
+        <item name="android:height">56dp</item>
     </style>
 
     <style name="DarkInputField">