diff --git a/app-sample/src/main/java/io/noties/markwon/app/readme/ReadMeActivity.kt b/app-sample/src/main/java/io/noties/markwon/app/readme/ReadMeActivity.kt
index ed26b0df..c8fe2507 100644
--- a/app-sample/src/main/java/io/noties/markwon/app/readme/ReadMeActivity.kt
+++ b/app-sample/src/main/java/io/noties/markwon/app/readme/ReadMeActivity.kt
@@ -77,9 +77,9 @@ class ReadMeActivity : Activity() {
                 .usePlugin(StrikethroughPlugin.create())
                 .usePlugin(ReadMeImageDestinationPlugin(intent.data))
                 .usePlugin(IFramePlugIn.create())
-                .usePlugin(InLineLatexPlugIn.create(16.0f, 1080))
+                .usePlugin(InLineLatexPlugIn.create(46.0f, 1080))
                 .usePlugin(MarkwonInlineParserPlugin.create())
-                .usePlugin(JLatexMathPlugin.create(16.0f))
+                .usePlugin(JLatexMathPlugin.create(46.0f))
                 .usePlugin(object : AbstractMarkwonPlugin() {
                     override fun configureVisitor(builder: MarkwonVisitor.Builder) {
                         builder.on(FencedCodeBlock::class.java) { visitor, block ->
diff --git a/app-sample/src/main/res/drawable/bg_fence.xml b/app-sample/src/main/res/drawable/bg_fence.xml
new file mode 100644
index 00000000..41c40002
--- /dev/null
+++ b/app-sample/src/main/res/drawable/bg_fence.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<inset xmlns:android="http://schemas.android.com/apk/res/android"
+    android:insetBottom="-2dp"
+    >
+    <shape xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/rectangle">
+        <stroke
+            android:width="1dp"
+            android:color="#F1F2F3"
+            />
+        <corners android:radius="4dp"/>
+        <solid android:color="#F1F2F3"/>
+    </shape>
+</inset>
\ No newline at end of file
diff --git a/app-sample/src/main/res/layout/adapter_node_code_block.xml b/app-sample/src/main/res/layout/adapter_node_code_block.xml
index e538f011..d22cde1a 100644
--- a/app-sample/src/main/res/layout/adapter_node_code_block.xml
+++ b/app-sample/src/main/res/layout/adapter_node_code_block.xml
@@ -13,6 +13,7 @@
         android:id="@+id/text_view"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:background="@drawable/bg_fence"
         android:fontFamily="monospace"
         android:lineSpacingExtra="2dip"
         android:paddingLeft="16dip"