diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 262b305b..59d77a93 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,61 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@color/colorSurface">
+    android:theme="@style/Theme.Lacerta"
+    tools:context=".MainActivity">
 
-    <androidx.coordinatorlayout.widget.CoordinatorLayout
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/nav_host_fragment"
+        android:name="androidx.navigation.fragment.NavHostFragment"
         android:layout_width="0dp"
         android:layout_height="0dp"
-        app:layout_constraintBottom_toTopOf="@id/bottom_nav"
+        app:defaultNavHost="true"
+        app:layout_constraintBottom_toTopOf="@+id/bottom_nav"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent">
-
-        <com.google.android.material.appbar.AppBarLayout
-            android:id="@+id/app_bar_layout"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content">
-
-            <com.google.android.material.appbar.CollapsingToolbarLayout
-                android:id="@+id/collapsing_toolbar"
-                android:layout_width="match_parent"
-                android:layout_height="160dp"
-                android:background="@color/colorSurface"
-                android:fitsSystemWindows="true"
-                android:minHeight="?attr/actionBarSize"
-                app:collapsedTitleGravity="start|center_vertical"
-                app:contentScrim="@color/colorSecondaryContainer"
-                app:expandedTitleGravity="start|bottom"
-                app:expandedTitleMarginBottom="16dp"
-                app:expandedTitleMarginStart="16dp"
-                app:expandedTitleTextAppearance="@style/TextAppearance.MaterialComponents.Headline4"
-                app:layout_scrollFlags="scroll|exitUntilCollapsed">
-
-                <androidx.appcompat.widget.Toolbar
-                    android:id="@+id/toolbar"
-                    android:layout_width="match_parent"
-                    android:layout_height="?attr/actionBarSize"
-                    app:layout_collapseMode="pin"
-                    app:title="HOGE" />
-
-            </com.google.android.material.appbar.CollapsingToolbarLayout>
-
-        </com.google.android.material.appbar.AppBarLayout>
-
-        <androidx.fragment.app.FragmentContainerView
-
-            android:id="@+id/nav_host_fragment"
-            android:name="androidx.navigation.fragment.NavHostFragment"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            app:defaultNavHost="true"
-            app:navGraph="@navigation/main_nav"
-            tools:layout="@layout/fragment_home_top"
-            app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
-
-    </androidx.coordinatorlayout.widget.CoordinatorLayout>
+        app:layout_constraintTop_toTopOf="parent"
+        app:navGraph="@navigation/main_nav"
+        tools:layout="@layout/fragment_home_top" />
 
     <com.google.android.material.bottomnavigation.BottomNavigationView
         android:id="@+id/bottom_nav"