diff --git a/app/src/main/java/org/kiwix/kiwixmobile/main/MainActivity.java b/app/src/main/java/org/kiwix/kiwixmobile/main/MainActivity.java
index 71fa94d70..2a259851a 100644
--- a/app/src/main/java/org/kiwix/kiwixmobile/main/MainActivity.java
+++ b/app/src/main/java/org/kiwix/kiwixmobile/main/MainActivity.java
@@ -373,6 +373,7 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
     searchFiles();
     tabRecyclerView.setAdapter(tabsAdapter);
     new ItemTouchHelper(tabCallback).attachToRecyclerView(tabRecyclerView);
+    drawerLayout.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
   }
 
   //End of onCreate
@@ -541,15 +542,20 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
   }
 
   private void updateBottomToolbarArrowsAlpha() {
-    if (getCurrentWebView().canGoForward()) {
-      bottomToolbarArrowForward.setAlpha(1f);
-    } else {
-      bottomToolbarArrowForward.setAlpha(0.6f);
+    if (checkNull(bottomToolbarArrowBack)) {
+      if (getCurrentWebView().canGoForward()) {
+        bottomToolbarArrowForward.setAlpha(1f);
+      } else {
+        bottomToolbarArrowForward.setAlpha(0.6f);
+      }
     }
-    if (getCurrentWebView().canGoBack()) {
-      bottomToolbarArrowBack.setAlpha(1f);
-    } else {
-      bottomToolbarArrowBack.setAlpha(0.6f);
+
+    if (checkNull(bottomToolbarArrowForward)) {
+      if (getCurrentWebView().canGoBack()) {
+        bottomToolbarArrowBack.setAlpha(1f);
+      } else {
+        bottomToolbarArrowBack.setAlpha(0.6f);
+      }
     }
   }
 
@@ -786,14 +792,17 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
           updateTabSwitcherIcon();
         })
         .show();
+    openDefaultTab();
+    updateTabSwitcherIcon();
+  }
+
+  private void openDefaultTab() {
     new Handler().postDelayed(() -> {
       if (webViewList.size() == 0) {
         newTab(HOME_URL);
       }
-    }, 1500);
-    updateTabSwitcherIcon();
+    }, 100);
   }
-
   private void selectTab(int position) {
     currentWebViewIndex = position;
     tabsAdapter.setSelected(position);
@@ -1139,7 +1148,10 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
     if (event.getAction() == KeyEvent.ACTION_DOWN) {
       switch (keyCode) {
         case KeyEvent.KEYCODE_BACK:
-          if (getCurrentWebView().canGoBack()) {
+          if (tabSwitcherRoot.getVisibility() == View.VISIBLE) {
+            selectTab(currentWebViewIndex);
+            hideTabSwitcher();
+          } else if (getCurrentWebView().canGoBack()) {
             getCurrentWebView().goBack();
           } else if (isFullscreenOpened) {
             closeFullScreen();
@@ -1161,11 +1173,7 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
   void closeAllTabs() {
     webViewList.clear();
     tabsAdapter.notifyDataSetChanged();
-    new Handler().postDelayed(() -> {
-      if (webViewList.size() == 0) {
-        newTab(HOME_URL);
-      }
-    }, 1500);
+    openDefaultTab();
     updateTabSwitcherIcon();
   }
 
@@ -1293,20 +1301,22 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
   }
 
   private void updateBottomToolbarVisibility() {
-    if (sharedPreferenceUtil.getPrefBottomToolbar() && !HOME_URL.equals(
-        getCurrentWebView().getUrl())
-        && tabSwitcherRoot.getVisibility() != View.VISIBLE) {
-      bottomToolbar.setVisibility(View.VISIBLE);
-      if (getCurrentWebView() instanceof ToolbarStaticKiwixWebView
-          && sharedPreferenceUtil.getPrefBottomToolbar()) {
-        contentFrame.setPadding(0, 0, 0,
-            (int) getResources().getDimension(R.dimen.bottom_toolbar_height));
+    if (checkNull(bottomToolbar)) {
+      if (sharedPreferenceUtil.getPrefBottomToolbar() && !HOME_URL.equals(
+          getCurrentWebView().getUrl())
+          && tabSwitcherRoot.getVisibility() != View.VISIBLE) {
+        bottomToolbar.setVisibility(View.VISIBLE);
+        if (getCurrentWebView() instanceof ToolbarStaticKiwixWebView
+            && sharedPreferenceUtil.getPrefBottomToolbar()) {
+          contentFrame.setPadding(0, 0, 0,
+              (int) getResources().getDimension(R.dimen.bottom_toolbar_height));
+        } else {
+          contentFrame.setPadding(0, 0, 0, 0);
+        }
       } else {
+        bottomToolbar.setVisibility(View.GONE);
         contentFrame.setPadding(0, 0, 0, 0);
       }
-    } else {
-      bottomToolbar.setVisibility(View.GONE);
-      contentFrame.setPadding(0, 0, 0, 0);
     }
   }
 
@@ -1528,7 +1538,14 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
     View tabSwitcher = menu.findItem(R.id.menu_tab_switcher).getActionView();
     tabSwitcherIcon = tabSwitcher.findViewById(R.id.ic_tab_switcher_text);
     updateTabSwitcherIcon();
-    tabSwitcher.setOnClickListener(v -> showTabSwitcher());
+    tabSwitcher.setOnClickListener(v -> {
+      if (tabSwitcherRoot.getVisibility() == View.VISIBLE) {
+        hideTabSwitcher();
+        selectTab(currentWebViewIndex);
+      } else {
+        showTabSwitcher();
+      }
+    });
     return true;
   }
 
@@ -1583,14 +1600,16 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
   }
 
   private void refreshBookmarkSymbol() {
-    if (getCurrentWebView().getUrl() != null &&
-        ZimContentProvider.getId() != null &&
-        !getCurrentWebView().getUrl().equals(HOME_URL)) {
-      int icon = bookmarks.contains(getCurrentWebView().getUrl()) ? R.drawable.ic_bookmark_24dp
-          : R.drawable.ic_bookmark_border_24dp;
-      bottomToolbarBookmark.setImageResource(icon);
-    } else {
-      bottomToolbarBookmark.setImageResource(R.drawable.ic_bookmark_border_24dp);
+    if (checkNull(bottomToolbarBookmark)) {
+      if (getCurrentWebView().getUrl() != null &&
+          ZimContentProvider.getId() != null &&
+          !getCurrentWebView().getUrl().equals(HOME_URL)) {
+        int icon = bookmarks.contains(getCurrentWebView().getUrl()) ? R.drawable.ic_bookmark_24dp
+            : R.drawable.ic_bookmark_border_24dp;
+        bottomToolbarBookmark.setImageResource(icon);
+      } else {
+        bottomToolbarBookmark.setImageResource(R.drawable.ic_bookmark_border_24dp);
+      }
     }
   }
 
@@ -1841,16 +1860,18 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
 
   @Override
   public void webViewProgressChanged(int progress) {
-    progressBar.setProgress(progress);
-    if (progress == 100) {
-      if (requestClearHistoryAfterLoad) {
-        Log.d(TAG_KIWIX,
-            "Loading article finished and requestClearHistoryAfterLoad -> clearHistory");
-        getCurrentWebView().clearHistory();
-        requestClearHistoryAfterLoad = false;
-      }
+    if (checkNull(progressBar)) {
+      progressBar.setProgress(progress);
+      if (progress == 100) {
+        if (requestClearHistoryAfterLoad) {
+          Log.d(TAG_KIWIX,
+              "Loading article finished and requestClearHistoryAfterLoad -> clearHistory");
+          getCurrentWebView().clearHistory();
+          requestClearHistoryAfterLoad = false;
+        }
 
-      Log.d(TAG_KIWIX, "Loaded URL: " + getCurrentWebView().getUrl());
+        Log.d(TAG_KIWIX, "Loaded URL: " + getCurrentWebView().getUrl());
+      }
     }
   }
 
@@ -1950,4 +1971,8 @@ public class MainActivity extends BaseActivity implements WebViewCallback,
       fileSearch.scan(sharedPreferenceUtil.getPrefStorage());
     }
   }
+
+  public boolean checkNull(View view) {
+    return view != null;
+  }
 }
diff --git a/app/src/main/res/layout/header_language.xml b/app/src/main/res/layout/header_language.xml
index 9914b8af6..3706abb5a 100644
--- a/app/src/main/res/layout/header_language.xml
+++ b/app/src/main/res/layout/header_language.xml
@@ -11,7 +11,7 @@
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_margin="@dimen/activity_horizontal_margin"
-      android:textColor="@color/primary_text"
+      android:textColor="@color/textDarkPrimary"
       android:textSize="16sp"
       app:layout_constraintStart_toStartOf="parent"
       app:layout_constraintTop_toTopOf="parent"
diff --git a/app/src/main/res/layout/item_book.xml b/app/src/main/res/layout/item_book.xml
index 297604cef..3552460d6 100644
--- a/app/src/main/res/layout/item_book.xml
+++ b/app/src/main/res/layout/item_book.xml
@@ -29,7 +29,7 @@
       android:layout_height="wrap_content"
       android:layout_marginEnd="@dimen/activity_horizontal_margin"
       android:layout_marginStart="@dimen/activity_horizontal_margin"
-      android:textColor="@color/primary_text"
+      android:textColor="@color/textDarkPrimary"
       android:textSize="16sp"
       app:layout_constraintStart_toEndOf="@id/item_book_icon"
       app:layout_constraintTop_toTopOf="parent"
@@ -40,7 +40,7 @@
       android:id="@+id/item_book_date"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
-      android:textColor="@color/secondary_text"
+      android:textColor="@color/textDarkSecondary"
       app:layout_constraintStart_toStartOf="@id/item_book_title"
       app:layout_constraintTop_toBottomOf="@id/item_book_title"
       tools:text="1 Jan 2018"
@@ -52,7 +52,7 @@
       android:layout_height="wrap_content"
       android:layout_marginEnd="@dimen/activity_horizontal_margin"
       android:layout_marginStart="@dimen/activity_horizontal_margin"
-      android:textColor="@color/secondary_text"
+      android:textColor="@color/textDarkSecondary"
       app:layout_constraintStart_toEndOf="@id/item_book_date"
       app:layout_constraintTop_toTopOf="@id/item_book_date"
       tools:text="20 GB"
@@ -64,7 +64,7 @@
       android:layout_height="wrap_content"
       android:layout_marginEnd="@dimen/activity_horizontal_margin"
       android:layout_marginStart="@dimen/activity_horizontal_margin"
-      android:textColor="@color/secondary_text"
+      android:textColor="@color/textDarkSecondary"
       app:layout_constraintStart_toEndOf="@id/item_book_size"
       app:layout_constraintTop_toTopOf="@id/item_book_size"
       tools:text="10.1 K articles"
@@ -72,9 +72,12 @@
 
   <TextView
       android:id="@+id/item_book_description"
-      android:layout_width="wrap_content"
+      android:layout_width="0dp"
       android:layout_height="wrap_content"
-      android:textColor="@color/secondary_text"
+      android:textColor="@color/textDarkSecondary"
+      android:layout_marginEnd="8dp"
+      android:layout_marginRight="8dp"
+      app:layout_constraintEnd_toEndOf="parent"
       app:layout_constraintStart_toStartOf="@id/item_book_title"
       app:layout_constraintTop_toBottomOf="@id/item_book_date"
       tools:text="All wikipedia articles"
diff --git a/app/src/main/res/layout/item_intro_1.xml b/app/src/main/res/layout/item_intro_1.xml
index 500d26c56..2b5866957 100644
--- a/app/src/main/res/layout/item_intro_1.xml
+++ b/app/src/main/res/layout/item_intro_1.xml
@@ -47,7 +47,7 @@
       android:layout_height="wrap_content"
       android:text="@string/human_kind_knowledge"
       android:textAlignment="center"
-      android:textColor="@color/secondary_text"
+      android:textColor="@color/textDarkSecondary"
       android:textSize="15sp"
       app:layout_constraintEnd_toEndOf="parent"
       app:layout_constraintStart_toStartOf="parent"
diff --git a/app/src/main/res/layout/item_intro_2.xml b/app/src/main/res/layout/item_intro_2.xml
index 3b752457e..e11218abd 100644
--- a/app/src/main/res/layout/item_intro_2.xml
+++ b/app/src/main/res/layout/item_intro_2.xml
@@ -49,7 +49,7 @@
       android:layout_height="wrap_content"
       android:text="@string/download_books_message"
       android:textAlignment="center"
-      android:textColor="@color/secondary_text"
+      android:textColor="@color/textDarkSecondary"
       android:textSize="15sp"
       app:layout_constraintEnd_toEndOf="parent"
       app:layout_constraintStart_toStartOf="parent"
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index 890f952f4..be87d0648 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -6,8 +6,6 @@
   <color name="primary_dark_night">#ff212121</color>
   <color name="primary_light">#ffffff</color>
   <color name="accent">#2196F3</color>
-  <color name="primary_text">#212121</color>
-  <color name="secondary_text">#727272</color>
   <color name="icons">#212121</color>
   <color name="white">#fafafa</color>
   <color name="gray_list_bg">#0d000000</color>
@@ -27,4 +25,14 @@
   <color name="blueTransparent">#962e7ac4</color>
   <color name="actionModeBackground">#4285F4</color>
   <color name="titleBar">#000000</color>
+  <!-- Dark Text Color for Light Background -->
+  <color name="textDarkPrimary">#000000</color> <!-- 0% opacity-->
+  <color name="textDarkSecondary">#DE000000</color> <!--DE for 87% opacity-->
+  <color name="textDarkTertiary">#8A000000</color> <!--8A for 54% opacity-->
+
+  <!-- White Text Color for Dark Background -->
+  <color name="textLightPrimary">#FFFFFF</color> <!--100% opacity-->
+  <color name="textLightSecondary">#B2FFFFFF</color> <!--B2 for 70% opacity-->
+  <color name="textLightTertiary">#80FFFFFF</color> <!--80 for 50% opacity-->
+
 </resources>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index dafc29ae5..3b435f128 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -25,9 +25,9 @@
     <item name="dividerColor">@color/divider_light</item>
     <item name="selectedBackground">@drawable/list_bg_light</item>
     <item name="android:itemBackground">@color/primary_light</item>
-    <item name="android:textColorPrimary">@color/primary</item>
-    <item name="android:textColorSecondary">@color/primary</item>
-    <item name="android:textColorTertiary">@color/primary</item>
+    <item name="android:textColorPrimary">@color/textDarkPrimary</item>
+    <item name="android:textColorSecondary">@color/textDarkSecondary</item>
+    <item name="android:textColorTertiary">@color/textDarkTertiary</item>
     <item name="colorControlNormal">@color/accent</item>
   </style>
 
@@ -47,6 +47,12 @@
     <item name="listBackground">@drawable/list_bg</item>
     <item name="selectedBackground">@drawable/list_bg_light</item>
     <item name="android:itemBackground">@color/primary_light</item>
+    <item name="drawerBackground">@color/drawer_background_day</item>
+    <item name="dividerColor">@color/divider_light</item>
+    <item name="android:textColorPrimary">@color/textDarkPrimary</item>
+    <item name="android:textColorSecondary">@color/textDarkSecondary</item>
+    <item name="android:textColorTertiary">@color/textDarkTertiary</item>
+    <item name="colorControlNormal">@color/accent</item>
   </style>
 
   <style name="AppTheme.Night" parent="AppTheme.Base">
@@ -59,9 +65,9 @@
     <item name="android:itemBackground">@color/grey</item>
     <item name="android:itemTextAppearance">@color/grey</item>
     <item name="android:textColor">@color/primary_light</item>
-    <item name="android:textColorPrimary">@color/primary_light</item>
-    <item name="android:textColorSecondary">@color/primary_light</item>
-    <item name="android:textColorTertiary">@color/primary_light</item>
+    <item name="android:textColorPrimary">@color/textLightPrimary</item>
+    <item name="android:textColorSecondary">@color/textLightSecondary</item>
+    <item name="android:textColorTertiary">@color/textLightTertiary</item>
     <item name="android:alertDialogTheme">@style/AppTheme.Dialog.Night</item>
     <item name="colorControlNormal">@color/accent</item>
   </style>
@@ -86,8 +92,8 @@
   </style>
 
   <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat">
-    <item name="android:textColorPrimary">@color/primary_text</item>
-    <item name="actionMenuTextColor">@color/primary_text</item>
+    <item name="android:textColorPrimary">@color/textDarkPrimary</item>
+    <item name="actionMenuTextColor">@color/textDarkPrimary</item>
   </style>
 
   <style name="AppTheme.Dialog" parent="Theme.AppCompat.Light.Dialog.Alert">