diff --git a/app/build.gradle b/app/build.gradle
index c1e9c42..02e8bec 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -11,7 +11,6 @@ android {
         versionCode 1
         versionName "0.3.1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
-        vectorDrawables.useSupportLibrary = true
     }
     buildTypes {
         release {
diff --git a/app/src/androidTest_bak/java/com/vlprojects/divergence/ExampleInstrumentedTest.kt b/app/src/androidTest_bak/java/com/vlprojects/divergence/ExampleInstrumentedTest.kt
deleted file mode 100644
index 3f079e2..0000000
--- a/app/src/androidTest_bak/java/com/vlprojects/divergence/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.vlprojects.divergence
-
-import androidx.test.InstrumentationRegistry
-import androidx.test.runner.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getTargetContext()
-        assertEquals("com.vlprojects.divergence", appContext.packageName)
-    }
-}
diff --git a/app/src/main/res/layout/divergence_widget.xml b/app/src/main/res/layout/divergence_widget.xml
index e8f717f..1fb884f 100644
--- a/app/src/main/res/layout/divergence_widget.xml
+++ b/app/src/main/res/layout/divergence_widget.xml
@@ -4,6 +4,7 @@
               android:layout_height="wrap_content"
               android:layout_width="wrap_content"
               android:gravity="center_horizontal"
+              android:background="@android:color/black"
               tools:ignore="ContentDescription">
     <ImageView
         android:id="@+id/tube6"
diff --git a/app/src/main/res/values-night/colors.xml b/app/src/main/res/values-night/colors.xml
new file mode 100644
index 0000000..a98ba76
--- /dev/null
+++ b/app/src/main/res/values-night/colors.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#8C2800</color>
+    <color name="colorPrimaryDark">#4D1600</color>
+    <color name="colorAccent">#0095e6</color>
+</resources>
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
deleted file mode 100644
index e56a13c..0000000
--- a/app/src/main/res/values/dimens.xml
+++ /dev/null
@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<resources>
-    <dimen name="widget_margin">8dp</dimen>
-</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 5acce3c..90d4b7e 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,11 +1,7 @@
 <resources>
-
-    <!-- Base application theme. -->
     <style name="AppTheme" parent="Theme.AppCompat.DayNight.DarkActionBar">
-        <!-- Customize your theme here. -->
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
     </style>
-
 </resources>
diff --git a/app/src/main/res/xml/divergence_widget_info.xml b/app/src/main/res/xml/divergence_widget_info.xml
index b6b58aa..f90d5ab 100644
--- a/app/src/main/res/xml/divergence_widget_info.xml
+++ b/app/src/main/res/xml/divergence_widget_info.xml
@@ -3,7 +3,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:minWidth="200dp"
-    android:minHeight="50dp"
+    android:minHeight="40dp"
     android:updatePeriodMillis="7200000"
     android:previewImage="@drawable/appwidget_preview"
     android:initialLayout="@layout/divergence_widget"
diff --git a/app/src/test/java/com/vlprojects/divergence/ExampleUnitTest.kt b/app/src/test/java/com/vlprojects/divergence/ExampleUnitTest.kt
index 34332b1..1350e80 100644
--- a/app/src/test/java/com/vlprojects/divergence/ExampleUnitTest.kt
+++ b/app/src/test/java/com/vlprojects/divergence/ExampleUnitTest.kt
@@ -12,17 +12,4 @@ class ExampleUnitTest {
         println("omega range: $OMEGA_RANGE")
         println("all range: $ALL_RANGE")
     }
-
-    // @Test
-    fun testRandomizer() {
-        val dw = DivergenceWidget()
-        var newDiv = 500_000
-        var iteration = 0
-        while (newDiv in 0..999999) {
-            newDiv = dw.generateBalancedRandomDivergence(newDiv)
-            iteration++
-            //print("$newDiv, ")
-        }
-        println("$newDiv on iteration $iteration")
-    }
 }