diff --git a/app/src/main/java/org/ntlab/acanthus_client/views/paint/models/PageOperationModel.java b/app/src/main/java/org/ntlab/acanthus_client/views/paint/models/PageOperationModel.java
index 6dd7ef8..ed09b9c 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/views/paint/models/PageOperationModel.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/views/paint/models/PageOperationModel.java
@@ -64,7 +64,7 @@
         }
     }
 
-    //-----------------------------------------------------------------s
+    //-----------------------------------------------------------------
     // ページ番号を前に戻す
     public void decrementPageNo(MutableLiveData<Integer> mPageNo) {
         Integer editingNo = acanthus.getEditingPageNo();
diff --git a/app/src/main/java/org/ntlab/acanthus_client/views/paint/page/PageActivity.java b/app/src/main/java/org/ntlab/acanthus_client/views/paint/page/PageActivity.java
index 77e4f9c..52f50d2 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/views/paint/page/PageActivity.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/views/paint/page/PageActivity.java
@@ -8,7 +8,9 @@
 import android.util.Log;
 import android.view.MotionEvent;
 import android.view.View;
+import android.webkit.WebSettings;
 import android.webkit.WebView;
+import android.webkit.WebViewClient;
 
 import org.ntlab.acanthus_client.Acanthus;
 import org.ntlab.acanthus_client.R;
@@ -124,9 +126,11 @@
         setContentView(binding.getRoot());
 
         WebView webView = binding.pageWebview;
+        webView.setWebViewClient(new WebViewClient());
         webView.setInitialScale(1);
         webView.getSettings().setLoadWithOverviewMode(true);
         webView.getSettings().setUseWideViewPort(true);
+        webView.getSettings().setSupportZoom(false);
     }
 
     //-----------------------------------------------------------------
@@ -144,6 +148,8 @@
         pageViewModel.getPages().observe(this, new Observer<HashMap<Integer, String>>() {
             @Override
             public void onChanged(HashMap<Integer, String> s) {
+                binding.pageWebview.clearCache(true);
+                binding.pageWebview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
                 binding.pageWebview.loadUrl(s.get(pageViewModel.getCurPageNo().getValue()));
                 Log.d("a", "onFailure: -----------------------OK:Obs");
             }
diff --git a/app/src/main/res/layout/activity_page.xml b/app/src/main/res/layout/activity_page.xml
index 3f334eb..1c75869 100644
--- a/app/src/main/res/layout/activity_page.xml
+++ b/app/src/main/res/layout/activity_page.xml
@@ -8,25 +8,83 @@
 
     <WebView
         android:id="@+id/pageWebview"
-        android:layout_width="410dp"
-        android:layout_height="349dp"
+        android:layout_width="412dp"
+        android:layout_height="729dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.0"
+        app:layout_constraintHorizontal_bias="1.0"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.0">
+        app:layout_constraintTop_toTopOf="parent">
 
     </WebView>
 
     <Button
+        android:id="@+id/button_delPage"
+        android:layout_width="72dp"
+        android:layout_height="72dp"
+        android:layout_marginEnd="256dp"
+        android:layout_marginBottom="32dp"
+        android:background="@android:drawable/presence_online"
+        android:backgroundTint="#FF4545"
+        android:onClick="onClickDeletePage"
+        android:text="-"
+        android:textColor="#FFFFFF"
+        app:iconTint="#C32828"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/buttonBack" />
+
+    <TextView
+        android:id="@+id/textPageNo"
+        android:layout_width="97dp"
+        android:layout_height="48dp"
+        android:layout_marginTop="8dp"
+        android:autoText="false"
+        android:background="#00FFFFFF"
+        android:drawableBottom="@android:drawable/list_selector_background"
+        android:gravity="center_horizontal|center_vertical"
+        android:text="pageNo"
+        android:textColor="#000000"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="@+id/pageWebview" />
+
+    <Button
+        android:id="@+id/buttonBack"
+        android:layout_width="71dp"
+        android:layout_height="48dp"
+        android:layout_marginTop="8dp"
+        android:background="@android:drawable/ic_media_previous"
+        android:backgroundTint="#000000"
+        android:onClick="onClickToBackPage"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toStartOf="@+id/textPageNo"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:ignore="SpeakableTextPresentCheck" />
+
+    <Button
+        android:id="@+id/buttonNext"
+        android:layout_width="83dp"
+        android:layout_height="53dp"
+        android:layout_marginTop="8dp"
+        android:background="@android:drawable/ic_media_next"
+        android:backgroundTint="#000000"
+        android:onClick="onClickToAdvancePage"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="@+id/pageWebview"
+        app:layout_constraintStart_toEndOf="@+id/textPageNo"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:ignore="SpeakableTextPresentCheck" />
+
+    <Button
         android:id="@+id/button_addPage"
         android:layout_width="72dp"
         android:layout_height="72dp"
-        android:layout_marginStart="199dp"
-        android:layout_marginTop="64dp"
-        android:layout_marginEnd="24dp"
-        android:layout_marginBottom="127dp"
+        android:layout_marginStart="256dp"
+        android:layout_marginBottom="32dp"
         android:background="@android:drawable/presence_online"
         android:backgroundTint="#FF4545"
         android:onClick="onClickAddPage"
@@ -35,78 +93,7 @@
         app:iconTint="#C32828"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toEndOf="@+id/button_delPage"
-        app:layout_constraintTop_toBottomOf="@+id/buttonNext"
-        app:layout_constraintVertical_bias="0.0" />
-
-    <Button
-        android:id="@+id/button_delPage"
-        android:layout_width="72dp"
-        android:layout_height="72dp"
-        android:layout_marginStart="44dp"
-        android:layout_marginTop="69dp"
-        android:layout_marginBottom="127dp"
-        android:background="@android:drawable/presence_online"
-        android:backgroundTint="#FF4545"
-        android:onClick="onClickDeletePage"
-        android:text="-"
-        android:textColor="#FFFFFF"
-        app:iconTint="#C32828"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toStartOf="@+id/button_addPage"
-        app:layout_constraintHorizontal_bias="0.0"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/buttonBack"
-        app:layout_constraintVertical_bias="0.0" />
-
-    <TextView
-        android:id="@+id/textPageNo"
-        android:layout_width="97dp"
-        android:layout_height="48dp"
-        android:layout_marginBottom="256dp"
-        android:autoText="false"
-        android:background="@color/ic_launcher_background"
-        android:drawableBottom="@android:drawable/list_selector_background"
-        android:gravity="center_horizontal|center_vertical"
-        android:text="pageno"
-        android:textColor="#000000"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/pageWebview"
-        app:layout_constraintVertical_bias="0.807" />
-
-    <Button
-        android:id="@+id/buttonBack"
-        android:layout_width="71dp"
-        android:layout_height="48dp"
-        android:layout_marginStart="16dp"
-        android:layout_marginTop="66dp"
-        android:layout_marginBottom="268dp"
-        android:background="@android:drawable/ic_media_previous"
-        android:backgroundTint="#000000"
-        android:onClick="onClickToBackPage"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toStartOf="@+id/textPageNo"
-        app:layout_constraintHorizontal_bias="0.414"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/pageWebview"
-        tools:ignore="SpeakableTextPresentCheck" />
-
-    <Button
-        android:id="@+id/buttonNext"
-        android:layout_width="83dp"
-        android:layout_height="53dp"
-        android:layout_marginBottom="180dp"
-        android:background="@android:drawable/ic_media_next"
-        android:backgroundTint="#000000"
-        android:onClick="onClickToAdvancePage"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.675"
-        app:layout_constraintStart_toEndOf="@+id/textPageNo"
-        app:layout_constraintTop_toBottomOf="@+id/pageWebview"
-        app:layout_constraintVertical_bias="0.442"
-        tools:ignore="SpeakableTextPresentCheck" />
+        app:layout_constraintTop_toBottomOf="@+id/buttonNext" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file