diff --git a/app/src/main/java/lee/module/sample/MainActivity.kt b/app/src/main/java/lee/module/sample/MainActivity.kt
index 3a60e52..b25301d 100644
--- a/app/src/main/java/lee/module/sample/MainActivity.kt
+++ b/app/src/main/java/lee/module/sample/MainActivity.kt
@@ -37,7 +37,7 @@ class MainActivity : AppCompatActivity() {
         }
 
         getPdf = registerForActivityResult(ActivityResultContracts.GetContent()) {
-            startPdfActivity(it)
+            it?.let { startPdfActivity(it) }
         }
 
         findViewById<View>(R.id.btnOpenLocalFile).setOnClickListener {
@@ -80,7 +80,8 @@ class MainActivity : AppCompatActivity() {
     private fun startPdfActivity(uri: Uri) {
         Intent(Intent.ACTION_VIEW).apply {
             val fileExtension = MimeTypeMap.getFileExtensionFromUrl(uri.toString())
-            val type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileExtension.toLowerCase())
+            val type = MimeTypeMap.getSingleton()
+                .getMimeTypeFromExtension(fileExtension.toLowerCase())
             setDataAndType(uri, type)
             addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
 
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3b3795e..773dfe4 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout 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/white"
     android:gravity="center"
     android:orientation="vertical"
     tools:context=".MainActivity">
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 74d3c24..e18b747 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -11,6 +11,7 @@
         <item name="colorOnSecondary">@color/black</item>
         <!-- Status bar color. -->
         <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <item name="android:windowBackground">@android:color/transparent</item>
         <!-- Customize your theme here. -->
     </style>
 </resources>
\ No newline at end of file
diff --git a/pdfview/src/main/java/lee/module/pdfview/pdf/PdfView.kt b/pdfview/src/main/java/lee/module/pdfview/pdf/PdfView.kt
index 0312733..f307c4c 100644
--- a/pdfview/src/main/java/lee/module/pdfview/pdf/PdfView.kt
+++ b/pdfview/src/main/java/lee/module/pdfview/pdf/PdfView.kt
@@ -5,10 +5,7 @@ import android.graphics.pdf.PdfRenderer
 import android.net.Uri
 import android.util.AttributeSet
 import android.widget.Toast
-import androidx.core.content.ContextCompat
-import androidx.recyclerview.widget.DividerItemDecoration
 import androidx.recyclerview.widget.RecyclerView
-import lee.module.pdfview.R
 
 class PdfView @JvmOverloads constructor(
     context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
@@ -16,9 +13,6 @@ class PdfView @JvmOverloads constructor(
 
     init {
         layoutManager = PreloadLayoutManager(context)
-        addItemDecoration(DividerItemDecoration(context, VERTICAL).apply {
-            setDrawable(ContextCompat.getDrawable(context, R.drawable.pv_divider_vertical_16)!!)
-        })
     }
 
     fun setPdfRenderer(renderer: PdfRenderer) {
diff --git a/pdfview/src/main/java/lee/module/pdfview/pdf/PdfViewAdapter.kt b/pdfview/src/main/java/lee/module/pdfview/pdf/PdfViewAdapter.kt
index 00019dd..33448fd 100644
--- a/pdfview/src/main/java/lee/module/pdfview/pdf/PdfViewAdapter.kt
+++ b/pdfview/src/main/java/lee/module/pdfview/pdf/PdfViewAdapter.kt
@@ -4,9 +4,7 @@ import android.graphics.Bitmap
 import android.graphics.pdf.PdfRenderer
 import android.view.LayoutInflater
 import android.view.ViewGroup
-import androidx.core.view.updateLayoutParams
 import androidx.recyclerview.widget.RecyclerView
-import lee.module.pdfview.R
 import lee.module.pdfview.databinding.PvPdfItemBinding
 
 class PdfViewAdapter(
@@ -55,10 +53,6 @@ class PdfViewAdapter(
         RecyclerView.ViewHolder(binding.root) {
 
         fun bind(bitmap: Bitmap) {
-            binding.root.updateLayoutParams {
-                height =
-                    getScreenHeight() - itemView.resources.getDimensionPixelSize(R.dimen.pv_bottom_spacing)
-            }
             binding.ivContent.setImageBitmap(bitmap)
         }
     }
diff --git a/pdfview/src/main/java/lee/module/pdfview/pdf/PreloadLayoutManager.kt b/pdfview/src/main/java/lee/module/pdfview/pdf/PreloadLayoutManager.kt
index edf1d9a..bb0786d 100644
--- a/pdfview/src/main/java/lee/module/pdfview/pdf/PreloadLayoutManager.kt
+++ b/pdfview/src/main/java/lee/module/pdfview/pdf/PreloadLayoutManager.kt
@@ -7,6 +7,6 @@ import androidx.recyclerview.widget.RecyclerView
 class PreloadLayoutManager(context: Context) : LinearLayoutManager(context) {
 
     override fun getExtraLayoutSpace(state: RecyclerView.State?): Int {
-        return 3 * getScreenHeight()
+        return 5 * getScreenHeight()
     }
 }
diff --git a/pdfview/src/main/res/drawable/pv_divider_vertical_16.xml b/pdfview/src/main/res/drawable/pv_divider_vertical_16.xml
deleted file mode 100644
index c60109f..0000000
--- a/pdfview/src/main/res/drawable/pv_divider_vertical_16.xml
+++ /dev/null
@@ -1,5 +0,0 @@
-<shape xmlns:android="http://schemas.android.com/apk/res/android"
-    android:shape="rectangle">
-    <size android:height="16dp" />
-    <solid android:color="@android:color/transparent" />
-</shape>
diff --git a/pdfview/src/main/res/layout/activity_pv_pdf_view.xml b/pdfview/src/main/res/layout/activity_pv_pdf_view.xml
index b472b35..f00d875 100644
--- a/pdfview/src/main/res/layout/activity_pv_pdf_view.xml
+++ b/pdfview/src/main/res/layout/activity_pv_pdf_view.xml
@@ -2,4 +2,8 @@
 <lee.module.pdfview.pdf.PdfView xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/pdfView"
     android:layout_width="match_parent"
-    android:layout_height="match_parent" />
+    android:layout_height="match_parent"
+    android:background="@android:color/darker_gray"
+    android:clipToPadding="false"
+    android:paddingTop="8dp"
+    android:paddingBottom="8dp" />
diff --git a/pdfview/src/main/res/layout/pv_pdf_item.xml b/pdfview/src/main/res/layout/pv_pdf_item.xml
index fc22295..7c91711 100644
--- a/pdfview/src/main/res/layout/pv_pdf_item.xml
+++ b/pdfview/src/main/res/layout/pv_pdf_item.xml
@@ -1,8 +1,20 @@
 <?xml version="1.0" encoding="utf-8"?>
-<lee.module.pdfview.pdf.photoview.PhotoView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/ivContent"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="0dp"
-    android:layout_gravity="center"
-    android:background="@android:color/white"
-    android:minHeight="100dp" />
+    android:layout_height="match_parent">
+
+    <lee.module.pdfview.pdf.photoview.PhotoView
+        android:id="@+id/ivContent"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_gravity="center"
+        android:layout_marginTop="8dp"
+        android:layout_marginBottom="8dp"
+        android:background="@android:color/white"
+        android:minHeight="100dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>