added margins to the layouts;

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

@@ -5,6 +5,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:layout_margin="@dimen/answers_button_margin"
     >
 
   <ImageView

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

@@ -4,6 +4,7 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:layout_margin="@dimen/answers_button_margin"
     >
 
   <ImageView
@@ -22,6 +23,7 @@
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="@string/sorry_not_enough_questions"
+      android:textAlignment="center"
       app:layout_constraintLeft_toLeftOf="parent"
       app:layout_constraintRight_toRightOf="parent"
       app:layout_constraintTop_toBottomOf="@+id/error_invalid_image"

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

@@ -4,6 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:layout_margin="@dimen/answers_button_margin"
     tools:context="com.dfl.trivia.main.MainActivityFragment"
     >
 

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

@@ -4,6 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:layout_margin="@dimen/answers_button_margin"
     tools:context="com.dfl.trivia.question.QuestionActivityFragment"
     >
 
@@ -45,6 +46,7 @@
         android:id="@+id/false_button"
         android:layout_width="0dp"
         android:layout_height="match_parent"
+        android:layout_margin="@dimen/answers_button_margin"
         android:layout_weight="1"
         android:background="@android:color/holo_red_light"
         android:text="@string/false_answer"
@@ -54,6 +56,7 @@
         android:id="@+id/true_button"
         android:layout_width="0dp"
         android:layout_height="match_parent"
+        android:layout_margin="@dimen/answers_button_margin"
         android:layout_weight="1"
         android:background="@android:color/holo_green_light"
         android:text="@string/true_answer"
@@ -74,6 +77,7 @@
         android:id="@+id/answer_a_button"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:layout_margin="@dimen/answers_button_margin"
         android:layout_weight="1"
         android:background="@android:color/holo_orange_light"
         />
@@ -82,6 +86,7 @@
         android:id="@+id/answer_b_button"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:layout_margin="@dimen/answers_button_margin"
         android:layout_weight="1.0"
         android:background="@android:color/holo_green_light"
         />
@@ -90,6 +95,7 @@
         android:id="@+id/answer_c_button"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:layout_margin="@dimen/answers_button_margin"
         android:layout_weight="1.0"
         android:background="@android:color/holo_blue_light"
         />
@@ -98,6 +104,7 @@
         android:id="@+id/answer_d_button"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:layout_margin="@dimen/answers_button_margin"
         android:layout_weight="1.0"
         android:background="@android:color/holo_red_light"
         />

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

@@ -1,3 +1,5 @@
 <resources>
   <dimen name="fab_margin">16dp</dimen>
+  <dimen name="answers_button_margin">10dp</dimen>
+  <dimen name="layout_margin">10dp</dimen>
 </resources>

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

@@ -2,7 +2,7 @@
   <string name="app_name">Trivia</string>
   <string name="action_settings">Settings</string>
   <string name="ups_something_went_wrong">Ups! Something went wrong :(</string>
-  <string name="sorry_not_enough_questions">Sorry not enough questions :( Do you know some? Help us out!</string>
+  <string name="sorry_not_enough_questions">Sorry not enough questions :( \n Do you know some? Help us out!</string>
   <string name="i_want_to_help">I want to help!</string>
   <string name="start">Start</string>
   <string name="false_answer">False</string>