diff --git a/app/build.gradle b/app/build.gradle
index 42adbf2..cba598c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,12 +1,12 @@
-apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android'
-apply plugin: 'kotlin-android-extensions'
-apply plugin: 'shot'
+apply plugin: "com.android.application"
+apply plugin: "kotlin-android"
+apply plugin: "kotlin-android-extensions"
+apply plugin: "shot"
 
 android {
     compileSdkVersion 28
     defaultConfig {
-        applicationId "com.karumi"
+        applicationId "com.karumi.superheroes.jetpack"
         minSdkVersion 16
         targetSdkVersion 28
         versionCode 1
@@ -30,7 +30,7 @@ configurations {
 
 dependencies {
     /* Lint */
-    ktlint 'com.github.shyiko:ktlint:0.29.0'
+    ktlint "com.github.shyiko:ktlint:0.29.0"
 
     /* Kotlin */
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
@@ -45,15 +45,15 @@ dependencies {
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.1.0"
 
     /* DI */
-    implementation 'org.kodein.di:kodein-di-erased-jvm:6.0.1'
-    implementation 'org.kodein.di:kodein-di-framework-android-x:6.0.1'
+    implementation "org.kodein.di:kodein-di-erased-jvm:6.0.1"
+    implementation "org.kodein.di:kodein-di-framework-android-x:6.0.1"
 
     /* UI */
-    implementation 'com.squareup.picasso:picasso:2.5.2'
+    implementation "com.squareup.picasso:picasso:2.5.2"
     implementation "com.google.android.material:material:1.0.0"
 
     /* Testing */
-    testImplementation 'junit:junit:4.12'
+    testImplementation "junit:junit:4.12"
     testImplementation "org.mockito:mockito-core:2.23.4"
     androidTestImplementation "org.mockito:mockito-android:2.23.4"
     androidTestImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:2.1.0"
@@ -64,16 +64,16 @@ dependencies {
     }
     androidTestImplementation "com.android.support.test.espresso:espresso-intents:3.0.2"
 
-    androidTestImplementation('com.facebook.testing.screenshot:core:0.8.0') {
-        exclude group: 'com.crittercism.dexmaker', module: 'dexmaker'
-        exclude group: 'com.crittercism.dexmaker', module: 'dexmaker-dx'
+    androidTestImplementation("com.facebook.testing.screenshot:core:0.8.0") {
+        exclude group: "com.crittercism.dexmaker", module: "dexmaker"
+        exclude group: "com.crittercism.dexmaker", module: "dexmaker-dx"
     }
 
     androidTestImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:1.1.0"
 }
 
 shot {
-    appId = 'com.karumi'
+    appId = "com.karumi.superheroes.jetpack"
 }
 
 task ktlint(type: JavaExec) {
diff --git a/app/screenshots/com.karumi.jetpack.superheroes.ui.view.MainActivityTest_showsEmptyCaseIfThereAreNoSuperHeroes.png b/app/screenshots/com.karumi.jetpack.superheroes.ui.view.MainActivityTest_showsEmptyCaseIfThereAreNoSuperHeroes.png
index 1500e0e..2b7b895 100644
Binary files a/app/screenshots/com.karumi.jetpack.superheroes.ui.view.MainActivityTest_showsEmptyCaseIfThereAreNoSuperHeroes.png and b/app/screenshots/com.karumi.jetpack.superheroes.ui.view.MainActivityTest_showsEmptyCaseIfThereAreNoSuperHeroes.png differ
diff --git a/app/src/main/java/com/karumi/jetpack/superheroes/common/TimeProviders.kt b/app/src/main/java/com/karumi/jetpack/superheroes/common/TimeProviders.kt
index e92ae28..a554ae6 100644
--- a/app/src/main/java/com/karumi/jetpack/superheroes/common/TimeProviders.kt
+++ b/app/src/main/java/com/karumi/jetpack/superheroes/common/TimeProviders.kt
@@ -7,4 +7,3 @@ interface TimeProvider {
 class RealTimeProvider : TimeProvider {
     override val time = System.currentTimeMillis()
 }
-
diff --git a/app/src/main/res/layout/main_activity.xml b/app/src/main/res/layout/main_activity.xml
index 5a551c9..8f4cf2e 100644
--- a/app/src/main/res/layout/main_activity.xml
+++ b/app/src/main/res/layout/main_activity.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout 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"
@@ -12,14 +12,18 @@
     android:layout_height="?attr/actionBarSize"
     android:background="?attr/colorPrimary"
     android:theme="@style/AppTheme.AppBarOverlay"
+    app:layout_constraintTop_toTopOf="parent"
     app:popupTheme="@style/AppTheme.PopupOverlay" />
 
   <androidx.recyclerview.widget.RecyclerView
     android:id="@+id/recycler_view"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
+    android:layout_height="0dp"
     android:layout_below="@id/toolbar"
+    app:layout_constraintBottom_toBottomOf="parent"
+    app:layout_constraintTop_toBottomOf="@id/toolbar"
     tools:context="com.karumi.screenshot.ui.view.MainActivity"
+    tools:listitem="@layout/super_hero_row"
     tools:showIn="@layout/main_activity" />
 
   <androidx.core.widget.ContentLoadingProgressBar
@@ -27,7 +31,10 @@
     style="?android:attr/progressBarStyleLarge"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    android:layout_centerInParent="true" />
+    app:layout_constraintBottom_toBottomOf="parent"
+    app:layout_constraintEnd_toEndOf="parent"
+    app:layout_constraintStart_toStartOf="parent"
+    app:layout_constraintTop_toTopOf="parent" />
 
   <TextView
     android:id="@+id/tv_empty_case"
@@ -36,6 +43,11 @@
     android:layout_centerInParent="true"
     android:text="¯\\_(ツ)_/¯"
     android:textColor="@android:color/white"
-    android:visibility="gone" />
+    android:visibility="gone"
+    app:layout_constraintBottom_toBottomOf="parent"
+    app:layout_constraintEnd_toEndOf="parent"
+    app:layout_constraintStart_toStartOf="parent"
+    app:layout_constraintTop_toTopOf="parent"
+    tools:visibility="visible" />
 
-</RelativeLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/layout/super_hero_detail_activity.xml b/app/src/main/res/layout/super_hero_detail_activity.xml
index f08fa9f..7c2787d 100644
--- a/app/src/main/res/layout/super_hero_detail_activity.xml
+++ b/app/src/main/res/layout/super_hero_detail_activity.xml
@@ -118,7 +118,8 @@
       app:layout_constraintBottom_toBottomOf="parent"
       app:layout_constraintEnd_toEndOf="parent"
       app:layout_constraintStart_toStartOf="parent"
-      app:layout_constraintTop_toTopOf="parent" />
+      app:layout_constraintTop_toTopOf="parent"
+      tools:visibility="visible" />
 
   </androidx.constraintlayout.widget.ConstraintLayout>