diff --git a/.idea/misc.xml b/.idea/misc.xml
index d5d35ec..19aa6a5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="JDK" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/app/src/main/java/org/ntlab/acanthus_client/views/MainActivity.java b/app/src/main/java/org/ntlab/acanthus_client/views/MainActivity.java
index da35e65..3a989e7 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/views/MainActivity.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/views/MainActivity.java
@@ -1,6 +1,10 @@
 package org.ntlab.acanthus_client.views;
 
+import android.content.Intent;
+import android.content.SharedPreferences;
 import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
 
 import com.google.android.material.bottomnavigation.BottomNavigationView;
 
@@ -14,17 +18,32 @@
 import androidx.navigation.ui.NavigationUI;
 
 
-public class MainActivity extends AppCompatActivity {
+public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 
     private ActivityMainBinding binding;
 
+    private Button mBtDefault, mBtDark;
+
+    private SharedPreferences mPreferences;
+    private SharedPreferences.Editor mEditor;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         binding = ActivityMainBinding.inflate(getLayoutInflater());
+        mPreferences = getSharedPreferences("themeData", MODE_PRIVATE);
+        setTheme( mPreferences.getInt("theme", R.style.Theme_Acanthus) );
         setContentView(binding.getRoot());
 
+        mBtDefault  = (Button)findViewById(R.id.bt_default);
+        mBtDark = (Button)findViewById(R.id.bt_dark);
+
+        mBtDefault.setOnClickListener(this);
+        mBtDark.setOnClickListener(this);
+
+        mEditor = mPreferences.edit();
+
         BottomNavigationView navView = findViewById(R.id.nav_view);
         // Passing each menu ID as a set of Ids because each
         // menu should be considered as top level destinations.
@@ -36,4 +55,21 @@
         NavigationUI.setupWithNavController(binding.navView, navController);
     }
 
+    @Override
+    public void onClick(View view) {
+        switch (view.getId()) {
+            case R.id.bt_default: {
+                mEditor.putInt("theme", R.style.Theme_Acanthus);
+                break;
+            }
+            case R.id.bt_dark: {
+                mEditor.putInt("theme", R.style.Theme_Acanthus_Dark);
+                break;
+            }
+        }
+        mEditor.commit();
+        finish();
+        startActivity( new Intent( this, MainActivity.class ));
+    }
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/org/ntlab/acanthus_client/views/title/TitleActivity.java b/app/src/main/java/org/ntlab/acanthus_client/views/title/TitleActivity.java
index 02a8149..6a1dab4 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/views/title/TitleActivity.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/views/title/TitleActivity.java
@@ -33,8 +33,7 @@
         //ここに画像処理を記載する
         ImageView imageView = (ImageView) findViewById(R.id.gifImage);
         Glide.with(this).load(R.drawable.load).into(imageView);
-        TextView textView = (TextView)findViewById(R.id.textView3);
-        loadimg(imageView,textView);
+        loadimg(imageView);
 
 
 
@@ -43,13 +42,12 @@
     }
 
     ////////////////////////////////////////////////////////////////////
-    public void loadimg(ImageView imageView,TextView textView) {
+    public void loadimg(ImageView imageView) {
         Handler handler = new Handler();
         Runnable runnable = new Runnable() {
             @Override
             public void run() {
                 imageView.setVisibility(View.VISIBLE);
-                textView.setText("アカウント情報取得中");
             }
         };
         handler.postDelayed(runnable, 2000);
diff --git a/app/src/main/res/layout/activity_sign_up.xml b/app/src/main/res/layout/activity_sign_up.xml
index f2ac124..a5666df 100644
--- a/app/src/main/res/layout/activity_sign_up.xml
+++ b/app/src/main/res/layout/activity_sign_up.xml
@@ -22,67 +22,68 @@
 
     <EditText
         android:id="@+id/editTextTextSignUpPersonName"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginEnd="64dp"
+        android:layout_width="250dp"
+        android:layout_height="50dp"
         android:layout_marginBottom="520dp"
         android:ems="10"
         android:inputType="textPersonName"
         android:text="name"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.503"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.746" />
+        app:layout_constraintVertical_bias="0.857" />
 
     <EditText
         android:id="@+id/editTextTextSignUpEmailAddress"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginEnd="64dp"
-        android:layout_marginBottom="400dp"
+        android:layout_width="250dp"
+        android:layout_height="50dp"
         android:ems="10"
         android:inputType="textEmailAddress"
-        android:text="@dummy.com"
-        app:layout_constraintBottom_toBottomOf="parent"
+        android:text="d0@dummy.com"
+        app:layout_constraintBottom_toTopOf="@+id/textSignUpPassword"
         app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.496"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.643" />
+        app:layout_constraintVertical_bias="0.855" />
 
     <TextView
         android:id="@+id/textSignUpPassword"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginStart="28dp"
-        android:layout_marginBottom="260dp"
         android:text="パスワード"
-        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintBottom_toTopOf="@+id/editTextTextSignUpPassword"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.498"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.59" />
+        app:layout_constraintVertical_bias="1.0" />
 
     <TextView
         android:id="@+id/textSignEmail"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginStart="16dp"
-        android:layout_marginBottom="400dp"
         android:text="メールアドレス"
-        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintBottom_toTopOf="@+id/editTextTextSignUpEmailAddress"
+        app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.631" />
+        app:layout_constraintVertical_bias="0.972" />
 
     <TextView
         android:id="@+id/textSignName"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginStart="48dp"
         android:layout_marginBottom="540dp"
         android:text="名前"
         app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.498"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.738" />
+        app:layout_constraintVertical_bias="0.616" />
 
     <Button
         android:id="@+id/buttonSignUpRegister"
@@ -93,23 +94,24 @@
         android:text="新規登録"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHorizontal_bias="0.905"
+        app:layout_constraintHorizontal_bias="0.498"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.767" />
 
     <EditText
         android:id="@+id/editTextTextSignUpPassword"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginEnd="64dp"
-        android:layout_marginBottom="260dp"
+        android:layout_width="250dp"
+        android:layout_height="50dp"
         android:ems="10"
         android:inputType="textPassword"
         android:text="nittalab"
-        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintBottom_toTopOf="@+id/buttonSignUpRegister"
         app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.496"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.598" />
+        app:layout_constraintVertical_bias="0.864" />
 
     <Button
         android:id="@+id/buttonAlreadyLoggedIn"
@@ -121,6 +123,6 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:layout_constraintVertical_bias="0.601" />
+        app:layout_constraintVertical_bias="0.837" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_title.xml b/app/src/main/res/layout/activity_title.xml
index c92ca3b..641250e 100644
--- a/app/src/main/res/layout/activity_title.xml
+++ b/app/src/main/res/layout/activity_title.xml
@@ -44,19 +44,6 @@
         app:srcCompat="@drawable/load"
         tools:ignore="ContentDescription" />
 
-    <TextView
-        android:id="@+id/textView3"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="90dp"
-        android:layout_marginEnd="350dp"
-        android:textColor="#646464"
-        android:textSize="12sp"
-        app:layout_constraintBottom_toTopOf="@+id/view"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toEndOf="@+id/gifImage"
-        app:layout_constraintTop_toTopOf="parent" />
-
     <View
         android:id="@+id/view"
         android:layout_width="wrap_content"
diff --git a/app/src/main/res/layout/fragment_mypage.xml b/app/src/main/res/layout/fragment_mypage.xml
index 1f62ce2..bef2e96 100644
--- a/app/src/main/res/layout/fragment_mypage.xml
+++ b/app/src/main/res/layout/fragment_mypage.xml
@@ -63,4 +63,35 @@
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintVertical_bias="0.598" />
 
+    <Button
+        android:id="@+id/bt_default"
+        android:layout_width="70dp"
+        android:layout_height="33dp"
+        android:layout_marginTop="217dp"
+        android:layout_marginEnd="15dp"
+        android:layout_marginBottom="13dp"
+        android:text="Default"
+        android:textSize="20px"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.736"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/buttonAnimation"
+        app:layout_constraintVertical_bias="0.545" />
+
+    <Button
+        android:id="@+id/bt_dark"
+        android:layout_width="70dp"
+        android:layout_height="33dp"
+        android:layout_marginTop="213dp"
+        android:layout_marginBottom="13dp"
+        android:text="Dark"
+        android:textSize="20px"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.953"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/buttonAnimation"
+        app:layout_constraintVertical_bias="0.666" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 4c773a5..8ce8f27 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,17 +1,6 @@
-<resources xmlns:tools="http://schemas.android.com/tools">
+<resources>
     <!-- Base application theme. -->
-    <style name="Theme.Acanthus" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
-        <!-- Primary brand color. -->
-        <item name="colorPrimary">@color/purple_500</item>
-        <item name="colorPrimaryVariant">@color/purple_700</item>
-        <item name="colorOnPrimary">@color/white</item>
-        <!-- Secondary brand color. -->
-        <item name="colorSecondary">@color/teal_200</item>
-        <item name="colorSecondaryVariant">@color/teal_700</item>
-        <item name="colorOnSecondary">@color/black</item>
-        <!-- Status bar color. -->
-        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
-        <!-- Customize your theme here. -->
-    </style>
+    <style name="Theme.Acanthus" parent="Theme.AppCompat"/>
+    <style name="Theme.Acanthus.Dark" parent="Theme.AppCompat"/>
     <style name="AppTheme.NoTitleBar" parent="Theme.AppCompat.NoActionBar"/>
 </resources>
\ No newline at end of file