diff --git a/app/src/main/java/io/legado/app/ui/readbook/config/PaddingConfigDialog.java b/app/src/main/java/io/legado/app/ui/readbook/config/PaddingConfigDialog.java
deleted file mode 100644
index dfbfbb641..000000000
--- a/app/src/main/java/io/legado/app/ui/readbook/config/PaddingConfigDialog.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package io.legado.app.ui.readbook.config;
-
-public class PaddingConfigDialog {
-}
diff --git a/app/src/main/java/io/legado/app/ui/readbook/config/PaddingConfigDialog.kt b/app/src/main/java/io/legado/app/ui/readbook/config/PaddingConfigDialog.kt
new file mode 100644
index 000000000..f8405012e
--- /dev/null
+++ b/app/src/main/java/io/legado/app/ui/readbook/config/PaddingConfigDialog.kt
@@ -0,0 +1,41 @@
+package io.legado.app.ui.readbook.config
+
+import android.os.Bundle
+import android.util.DisplayMetrics
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.DialogFragment
+import io.legado.app.R
+import io.legado.app.ui.readbook.Help
+
+class PaddingConfigDialog : DialogFragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        return super.onCreateView(inflater, container, savedInstanceState)
+    }
+
+    override fun onStart() {
+        super.onStart()
+        val dm = DisplayMetrics()
+        activity?.windowManager?.defaultDisplay?.getMetrics(dm)
+        dialog?.window?.let {
+            it.setBackgroundDrawableResource(R.color.transparent)
+            it.decorView.setPadding(0, 0, 0, 0)
+            val attr = it.attributes
+            attr.dimAmount = 0.0f
+            it.attributes = attr
+            it.setLayout((dm.widthPixels * 0.9).toInt(), ViewGroup.LayoutParams.WRAP_CONTENT)
+            Help.upSystemUiVisibility(it)
+        }
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+    }
+
+}