diff --git a/app/build.gradle b/app/build.gradle
index de058cc..654fdf1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -43,6 +43,7 @@ android {
 dependencies {
     implementation 'com.simplemobiletools:commons:3.18.6'
     implementation 'com.squareup:otto:1.3.8'
+    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
 }
 
 Properties props = new Properties()
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 8fae723..f578456 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -38,7 +38,6 @@
 
         <activity
             android:name=".activities.MainActivity"
-            android:screenOrientation="portrait"
             android:theme="@style/AppTheme"/>
 
         <activity
@@ -50,9 +49,7 @@
             </intent-filter>
         </activity>
 
-        <activity
-            android:name=".activities.BrightDisplayActivity"
-            android:screenOrientation="portrait"/>
+        <activity android:name=".activities.BrightDisplayActivity"/>
 
         <activity
             android:name=".activities.SettingsActivity"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 6f599bf..4202685 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,44 +1,70 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
+<ScrollView
     xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/main_holder"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/main_scrollview"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:gravity="center"
-    android:orientation="vertical"
-    android:padding="@dimen/activity_margin">
+    android:fillViewport="true">
 
-    <ImageView
-        android:id="@+id/toggle_btn"
-        android:layout_width="@dimen/main_button_size"
-        android:layout_height="@dimen/main_button_size"
-        android:layout_marginBottom="@dimen/activity_margin"
-        android:background="@drawable/circles_big"/>
+    <android.support.constraint.ConstraintLayout
+        android:id="@+id/main_holder"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
 
-    <ImageView
-        android:id="@+id/bright_display_btn"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginBottom="@dimen/activity_margin"
-        android:layout_marginTop="@dimen/buttons_margin"
-        android:background="@drawable/ic_bright_display"
-        android:padding="@dimen/activity_margin"/>
+        <ImageView
+            android:id="@+id/toggle_btn"
+            android:layout_width="@dimen/main_button_size"
+            android:layout_height="@dimen/main_button_size"
+            android:layout_marginBottom="@dimen/activity_margin"
+            android:layout_marginTop="@dimen/activity_margin"
+            android:background="@drawable/circles_big"
+            app:layout_constraintBottom_toTopOf="@+id/bright_display_btn"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"/>
 
-    <ImageView
-        android:id="@+id/stroboscope_btn"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="@dimen/buttons_margin"
-        android:background="@drawable/ic_stroboscope"
-        android:padding="@dimen/activity_margin"/>
+        <ImageView
+            android:id="@+id/bright_display_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="@dimen/activity_margin"
+            android:layout_marginTop="@dimen/buttons_margin"
+            android:background="@drawable/ic_bright_display"
+            android:padding="@dimen/activity_margin"
+            app:layout_constraintBottom_toTopOf="@+id/stroboscope_btn"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/toggle_btn"/>
 
-    <com.simplemobiletools.commons.views.MySeekBar
-        android:id="@+id/stroboscope_bar"
-        android:layout_width="@dimen/seekbar_width"
-        android:layout_height="wrap_content"
-        android:layout_margin="@dimen/activity_margin"
-        android:paddingBottom="@dimen/medium_margin"
-        android:paddingTop="@dimen/medium_margin"
-        android:visibility="invisible"/>
+        <ImageView
+            android:id="@+id/stroboscope_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/buttons_margin"
+            android:background="@drawable/ic_stroboscope"
+            android:padding="@dimen/activity_margin"
+            app:layout_constraintBottom_toTopOf="@+id/stroboscope_bar"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/bright_display_btn"/>
 
-</LinearLayout>
+        <com.simplemobiletools.commons.views.MySeekBar
+            android:id="@+id/stroboscope_bar"
+            android:layout_width="@dimen/seekbar_width"
+            android:layout_height="wrap_content"
+            android:layout_margin="@dimen/activity_margin"
+            android:paddingBottom="@dimen/medium_margin"
+            android:paddingTop="@dimen/medium_margin"
+            android:visibility="invisible"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.5"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/stroboscope_btn"/>
+
+    </android.support.constraint.ConstraintLayout>
+</ScrollView>