diff --git a/app/build.gradle b/app/build.gradle
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -54,7 +54,6 @@
 
     dependencies {
         //new libraries
-
     }
 }
 
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          >
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
     <uses-permission android:name="android.permission.INTERNET"/>
@@ -13,18 +12,18 @@
 
     <queries>
         <intent>
-            <action android:name="android.intent.action.VIEW" />
-            <data android:scheme="http" />
+            <action android:name="android.intent.action.VIEW"/>
+            <data android:scheme="http"/>
         </intent>
         <intent>
-            <action android:name="android.intent.action.VIEW" />
-            <data android:scheme="https" />
+            <action android:name="android.intent.action.VIEW"/>
+            <data android:scheme="https"/>
         </intent>
         <intent>
-            <action android:name="com.google.zxing.client.android.SCAN" />
+            <action android:name="com.google.zxing.client.android.SCAN"/>
         </intent>
         <intent>
-            <action android:name="com.google.zxing.client.android.ENCODE" />
+            <action android:name="com.google.zxing.client.android.ENCODE"/>
         </intent>
     </queries>
 
@@ -36,7 +35,6 @@
             android:networkSecurityConfig="@xml/networks_security_config"
             android:roundIcon="@mipmap/ic_launcher_round"
             android:theme="@style/AppTheme.NoActionBar">
-
         <activity
                 android:name=".ActivityExperiments"
                 android:label="@string/experiments"
@@ -44,10 +42,10 @@
         </activity>
         <activity
                 android:name=".ActivityPrincipal"
+                android:exported="true"
                 android:label="@string/app_name"
                 android:screenOrientation="portrait"
-                android:windowSoftInputMode="adjustResize"
-            android:exported="true">
+                android:windowSoftInputMode="adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
 
@@ -105,7 +103,6 @@
                 android:enabled="true"
                 android:exported="false">
         </provider>
-
         <!-- Don't show the additional frame on samsung phones -->
         <meta-data
                 android:name="com.samsung.android.icon_container.has_icon_container"
diff --git a/app/src/main/java/it/reyboz/bustorino/fragments/ArrivalsFragment.java b/app/src/main/java/it/reyboz/bustorino/fragments/ArrivalsFragment.java
--- a/app/src/main/java/it/reyboz/bustorino/fragments/ArrivalsFragment.java
+++ b/app/src/main/java/it/reyboz/bustorino/fragments/ArrivalsFragment.java
@@ -65,8 +65,11 @@
 import it.reyboz.bustorino.util.LinesNameSorter;
 import it.reyboz.bustorino.util.ViewUtils;
 
+import static it.reyboz.bustorino.fragments.ScreenBaseFragment.setOption;
+
 public class ArrivalsFragment extends ResultBaseFragment implements LoaderManager.LoaderCallbacks<Cursor> {
 
+    private static final String OPTION_SHOW_LEGEND = "show_legend";
     private final static String KEY_STOP_ID = "stopid";
     private final static String KEY_STOP_NAME = "stopname";
     private final static String DEBUG_TAG_ALL = "BUSTOArrivalsFragment";
@@ -92,6 +95,9 @@
     protected RecyclerView arrivalsRecyclerView;
     private PalinaAdapter mListAdapter = null;
 
+    private TextView howDoesItWorkTextView;
+    private Button hideHintButton;
+
 
     //private NestedScrollView theScrollView;
     protected RecyclerView noArrivalsRecyclerView;
@@ -181,6 +187,11 @@
         View root = inflater.inflate(R.layout.fragment_arrivals, container, false);
         messageTextView = root.findViewById(R.id.messageTextView);
         addToFavorites = root.findViewById(R.id.addToFavorites);
+        // "How does it work part"
+        howDoesItWorkTextView = root.findViewById(R.id.howDoesItWorkTextView);
+        hideHintButton = root.findViewById(R.id.hideHintButton);
+        hideHintButton.setOnClickListener(this::onHideHint);
+
         //theScrollView = root.findViewById(R.id.arrivalsScrollView);
         // recyclerview holding the arrival times
         arrivalsRecyclerView = root.findViewById(R.id.arrivalsRecyclerView);
@@ -288,6 +299,10 @@
             updateMessage();
         }
 
+        if (ScreenBaseFragment.getOption(requireContext(),OPTION_SHOW_LEGEND, true)) {
+            showHints();
+        }
+
 
     }
 
@@ -333,6 +348,23 @@
         this.reloadOnResume = reloadOnResume;
     }
 
+    // HINT "HOW TO USE"
+    private void showHints() {
+        howDoesItWorkTextView.setVisibility(View.VISIBLE);
+        hideHintButton.setVisibility(View.VISIBLE);
+        //actionHelpMenuItem.setVisible(false);
+    }
+
+    private void hideHints() {
+        howDoesItWorkTextView.setVisibility(View.GONE);
+        hideHintButton.setVisibility(View.GONE);
+        //actionHelpMenuItem.setVisible(true);
+    }
+
+    public void onHideHint(View v) {
+        hideHints();
+        setOption(requireContext(),OPTION_SHOW_LEGEND, false);
+    }
     /**
      * Give the fetchers
      * @return the list of the fetchers
diff --git a/app/src/main/java/it/reyboz/bustorino/fragments/MainScreenFragment.java b/app/src/main/java/it/reyboz/bustorino/fragments/MainScreenFragment.java
--- a/app/src/main/java/it/reyboz/bustorino/fragments/MainScreenFragment.java
+++ b/app/src/main/java/it/reyboz/bustorino/fragments/MainScreenFragment.java
@@ -68,7 +68,6 @@
 public class MainScreenFragment extends ScreenBaseFragment implements  FragmentListenerMain{
 
 
-    private static final String OPTION_SHOW_LEGEND = "show_legend";
     private static final String SAVED_FRAGMENT="saved_fragment";
 
     private static final String DEBUG_TAG = "BusTO - MainFragment";
@@ -82,8 +81,7 @@
     private EditText busStopSearchByIDEditText;
     private EditText busStopSearchByNameEditText;
     private ProgressBar progressBar;
-    private TextView howDoesItWorkTextView;
-    private Button hideHintButton;
+
     private MenuItem actionHelpMenuItem;
     private FloatingActionButton floatingActionButton;
     private FrameLayout resultFrameLayout;
@@ -279,8 +277,7 @@
         busStopSearchByIDEditText = root.findViewById(R.id.busStopSearchByIDEditText);
         busStopSearchByNameEditText = root.findViewById(R.id.busStopSearchByNameEditText);
         progressBar = root.findViewById(R.id.progressBar);
-        howDoesItWorkTextView = root.findViewById(R.id.howDoesItWorkTextView);
-        hideHintButton = root.findViewById(R.id.hideHintButton);
+
         swipeRefreshLayout = root.findViewById(R.id.listRefreshLayout);
         floatingActionButton = root.findViewById(R.id.floatingActionButton);
         resultFrameLayout = root.findViewById(R.id.resultFrame);
@@ -311,7 +308,6 @@
         coordLayout = root.findViewById(R.id.coord_layout);
 
         floatingActionButton.setOnClickListener((this::onToggleKeyboardLayout));
-        hideHintButton.setOnClickListener(this::onHideHint);
 
         AppCompatImageButton qrButton = root.findViewById(R.id.QRButton);
         qrButton.setOnClickListener(this::onQRButtonClick);
@@ -527,11 +523,7 @@
             barcodeLauncher.launch(scanOptions);
         }
     }
-    public void onHideHint(View v) {
 
-        hideHints();
-        setOption(OPTION_SHOW_LEGEND, false);
-    }
     /**
      * OK this is pure shit
      *
@@ -618,18 +610,6 @@
         busStopSearchByIDEditText.setSelection(busStopID.length());
     }
 
-    private void showHints() {
-        howDoesItWorkTextView.setVisibility(View.VISIBLE);
-        hideHintButton.setVisibility(View.VISIBLE);
-        //actionHelpMenuItem.setVisible(false);
-    }
-
-    private void hideHints() {
-        howDoesItWorkTextView.setVisibility(View.GONE);
-        hideHintButton.setVisibility(View.GONE);
-        //actionHelpMenuItem.setVisible(true);
-    }
-
     @Nullable
     @org.jetbrains.annotations.Nullable
     @Override
@@ -711,9 +691,6 @@
             switch (fragmentType) {
                 case ARRIVALS:
                     prepareGUIForBusLines();
-                    if (getOption(OPTION_SHOW_LEGEND, true)) {
-                        showHints();
-                    }
                     break;
                 case STOPS:
                     prepareGUIForBusStops();
diff --git a/app/src/main/java/it/reyboz/bustorino/fragments/ScreenBaseFragment.java b/app/src/main/java/it/reyboz/bustorino/fragments/ScreenBaseFragment.java
--- a/app/src/main/java/it/reyboz/bustorino/fragments/ScreenBaseFragment.java
+++ b/app/src/main/java/it/reyboz/bustorino/fragments/ScreenBaseFragment.java
@@ -16,7 +16,7 @@
 
 public abstract class ScreenBaseFragment extends Fragment {
 
-    protected final String PREF_FILE= BuildConfig.APPLICATION_ID+".fragment_prefs";
+    protected final static String PREF_FILE= BuildConfig.APPLICATION_ID+".fragment_prefs";
 
     protected void setOption(String optionName, boolean value) {
         Context mContext = getContext();
@@ -27,8 +27,8 @@
 
     protected boolean getOption(String optionName, boolean optDefault) {
         Context mContext = getContext();
-        SharedPreferences preferences = mContext.getSharedPreferences(PREF_FILE, MODE_PRIVATE);
-        return preferences.getBoolean(optionName, optDefault);
+        assert mContext != null;
+        return getOption(mContext, optionName, optDefault);
     }
 
     protected void showToastMessage(int messageID, boolean short_lenght) {
@@ -52,4 +52,14 @@
      */
     @Nullable
     public abstract View getBaseViewForSnackBar();
+
+    public static boolean getOption(Context context, String optionName, boolean optDefault){
+        SharedPreferences preferences = context.getSharedPreferences(PREF_FILE, MODE_PRIVATE);
+        return preferences.getBoolean(optionName, optDefault);
+    }
+    public static void setOption(Context context,String optionName, boolean value) {
+        SharedPreferences.Editor editor = context.getSharedPreferences(PREF_FILE, MODE_PRIVATE).edit();
+        editor.putBoolean(optionName, value);
+        editor.apply();
+    }
 }
diff --git a/app/src/main/res/drawable/top_bottom_border_radius.xml b/app/src/main/res/drawable/top_bottom_border_radius.xml
new file mode 100644
--- /dev/null
+++ b/app/src/main/res/drawable/top_bottom_border_radius.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <solid android:color="@color/black" />
+    <corners
+        android:bottomLeftRadius="10dp"
+        android:bottomRightRadius="10dp"
+        android:topLeftRadius="10dp"
+        android:topRightRadius="10dp" />
+</shape>
\ No newline at end of file
diff --git a/app/src/main/res/drawable/top_bottom_border_radius_with_border.xml b/app/src/main/res/drawable/top_bottom_border_radius_with_border.xml
new file mode 100644
--- /dev/null
+++ b/app/src/main/res/drawable/top_bottom_border_radius_with_border.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <solid android:color="@color/black" />
+    <stroke
+        android:width="2dip"
+        android:color="@color/black_900" />
+    <corners
+        android:bottomLeftRadius="10dp"
+        android:bottomRightRadius="10dp"
+        android:topLeftRadius="10dp"
+        android:topRightRadius="10dp" />
+</shape>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_arrivals.xml b/app/src/main/res/layout/fragment_arrivals.xml
--- a/app/src/main/res/layout/fragment_arrivals.xml
+++ b/app/src/main/res/layout/fragment_arrivals.xml
@@ -5,7 +5,41 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical"
-        android:paddingTop="8dp">
+        android:paddingTop="8dp"
+        android:animateLayoutChanges="true">
+        <TextView
+                android:id="@+id/howDoesItWorkTextView"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="16dp"
+                android:layout_marginEnd="16dp"
+                android:layout_marginLeft="16dip"
+                android:layout_marginRight="16dp"
+                android:layout_marginStart="16dip"
+                android:layout_marginTop="10dp"
+                android:layout_toLeftOf="@+id/hideHintButton"
+                android:layout_toStartOf="@+id/hideHintButton"
+                android:text="@string/howDoesItWork"
+                android:textAppearance="?android:attr/textAppearanceSmall"
+                android:textColor="@color/blue_500"
+                android:visibility="gone" android:layout_alignParentTop="true"/>
+
+        <Button
+                android:id="@+id/hideHintButton"
+                style="?android:attr/buttonStyleSmall"
+                android:layout_width="85dip"
+                android:layout_height="wrap_content"
+                android:layout_alignBottom="@+id/howDoesItWorkTextView"
+                android:layout_alignParentEnd="true"
+                android:layout_alignParentRight="true"
+                android:layout_marginEnd="16dp"
+                android:layout_marginRight="16dp"
+                android:layout_marginBottom="5dp"
+                android:background="@drawable/route_background_bus"
+                android:text="@string/hint_button"
+                android:textColor="@color/grey_100"
+                android:textSize="19sp"
+                android:visibility="gone" />
 
         <androidx.cardview.widget.CardView
                 android:id="@+id/messageCardView"
@@ -13,6 +47,9 @@
                 android:layout_height="wrap_content"
                 app:cardCornerRadius="5dp"
                 app:cardElevation="2dp"
+                android:layout_below="@id/howDoesItWorkTextView"
+                android:layout_marginStart="5dp"
+                android:layout_marginEnd="5dp"
         >
 
                 <TextView
diff --git a/app/src/main/res/layout/fragment_lines_detail.xml b/app/src/main/res/layout/fragment_lines_detail.xml
--- a/app/src/main/res/layout/fragment_lines_detail.xml
+++ b/app/src/main/res/layout/fragment_lines_detail.xml
@@ -34,7 +34,7 @@
                 android:id="@+id/routeDescrTextView"
                 app:layout_constraintStart_toStartOf="parent"
                 android:textAppearance="@style/TextAppearance.AppCompat.Body1"
-                android:textColor="@color/grey_600"
+                android:textColor="?android:attr/textColorPrimary"
                 android:gravity="center_vertical"
                 android:textSize="18sp"
                 android:layout_marginLeft="10dp"
diff --git a/app/src/main/res/layout/fragment_main_screen.xml b/app/src/main/res/layout/fragment_main_screen.xml
--- a/app/src/main/res/layout/fragment_main_screen.xml
+++ b/app/src/main/res/layout/fragment_main_screen.xml
@@ -97,38 +97,7 @@
             android:indeterminateOnly="true"
             android:visibility="gone" />
 
-    <TextView
-            android:id="@+id/howDoesItWorkTextView"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_marginBottom="5dp"
-            android:layout_marginEnd="16dp"
-            android:layout_marginLeft="16dip"
-            android:layout_marginRight="16dp"
-            android:layout_marginStart="16dip"
-            android:layout_marginTop="10dp"
-            android:layout_toLeftOf="@+id/hideHintButton"
-            android:layout_toStartOf="@+id/hideHintButton"
-            android:text="@string/howDoesItWork"
-            android:textAppearance="?android:attr/textAppearanceSmall"
-            android:textColor="@color/blue_500"
-            android:visibility="gone" android:layout_below="@+id/searchButton"/>
 
-    <Button
-            android:id="@+id/hideHintButton"
-            style="?android:attr/buttonStyleSmall"
-            android:layout_width="85dip"
-            android:layout_height="wrap_content"
-            android:layout_alignBottom="@+id/howDoesItWorkTextView"
-            android:layout_alignParentEnd="true"
-            android:layout_alignParentRight="true"
-            android:layout_marginEnd="16dp"
-            android:layout_marginRight="16dp"
-            android:background="@drawable/route_background_bus"
-            android:text="@string/hint_button"
-            android:textColor="@color/grey_100"
-            android:textSize="19sp"
-            android:visibility="gone" />
 
 
     <androidx.coordinatorlayout.widget.CoordinatorLayout
@@ -139,7 +108,7 @@
             android:layout_alignParentEnd="true"
             android:layout_alignParentRight="true"
             android:layout_gravity="bottom|end"
-            android:layout_below="@+id/howDoesItWorkTextView"
+            android:layout_below="@+id/searchButton"
 
     >
         <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -3,7 +3,7 @@
 
     <color name="orange_500">#ff9800</color>
     <color name="orange_700">#F57C00</color>
-    <color name="orange_700_40light"> #cc6600</color>
+    <color name="orange_700_40light">#cc6600</color>
     <color name="orange_700_30light">#994d00</color>
     <color name="blue_500">#2196F3</color>
     <color name="blue_620">#2a65e8</color>
@@ -43,5 +43,13 @@
     <color name="line_drawn_poly">@color/red_dark</color>
 
     <color name="bus_marker_color">@color/blue_extra</color>
+    <color name="light_blue_600">#FF039BE5</color>
+    <color name="light_blue_900">#FF01579B</color>
+    <color name="light_blue_A200">#FF40C4FF</color>
+    <color name="light_blue_A400">#FF00B0FF</color>
+    <color name="black_overlay">#66000000</color>
+
+
+    <color name="colorTransparent">#00000000</color>
 
 </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
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -51,5 +51,25 @@
         <item name="editTextPreferenceStyle">@style/Preference.DialogPreference.EditTextPreference</item>
         <item name="preferenceFragmentListStyle">@style/PreferenceFragmentList</item>
     </style>
+    <style name="Widget.AppTheme.NoActionBar.ActionBar.Fullscreen" parent="Widget.AppCompat.ActionBar">
+        <item name="android:background">@color/black_overlay</item>
+    </style>
+
+    <style name="Widget.AppTheme.NoActionBar.ButtonBar.Fullscreen" parent="">
+        <item name="android:background">@color/black_overlay</item>
+        <item name="android:buttonBarStyle">?android:attr/buttonBarStyle</item>
+    </style>
+
+    <!-- styles that support night mode -->
+    <style name="AppThemeDayNight" parent="Theme.MaterialComponents.DayNight">
+    </style>
+
+    <style name="AppThemeDayNight.NoActionBar" parent="AppThemeDayNight">
+
+        <item name="android:windowTranslucentStatus">false</item>
+
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+    </style>
 
 </resources>
\ No newline at end of file