diff --git a/mpmaster/src/main/res/layout/activity_main.xml b/mpmaster/src/main/res/layout/activity_main.xml
index df48f43e..10d49e3f 100644
--- a/mpmaster/src/main/res/layout/activity_main.xml
+++ b/mpmaster/src/main/res/layout/activity_main.xml
@@ -12,6 +12,7 @@
         android:layout_height="wrap_content"
         android:layout_marginStart="12dp"
         android:layout_marginTop="12dp"
+        android:textSize="24sp"
         android:text=""
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />