diff --git a/example/src/main.cpp b/example/src/main.cpp
index b2f5cc9..3717ddc 100644
--- a/example/src/main.cpp
+++ b/example/src/main.cpp
@@ -2,7 +2,9 @@
 #include "window/mwindow.h"
 #include "font/font_system.h"
 #include "widget/widget_new.h"
+#include "widget/compound_widget/mbutton.h"
 #include "widget/leaf_widget/mtext_block.h"
+#include "widget/panel_widget/mbox.h"
 
 int main(int argc, char* argv[]) {
 	mirage_app::get().init();
@@ -14,10 +16,28 @@ int main(int argc, char* argv[]) {
 
 	const auto& text_block = std::make_shared<mtext_block>();
 	text_block->set_text(U"Hello, World! 你好，世界!😀");
-	// text_block->set_text(U"😀");
+
+	const auto& text_block2 = std::make_shared<mtext_block>();
+	text_block2->set_text(U"Hello, World!");
+
+	const auto button = std::make_shared<mbutton>();
+	button->set_content(text_block);
+
+	const auto button2 = std::make_shared<mbutton>();
+	button2->set_content(text_block2);
 
 	const auto& window = mwindow::create({ 1024, 1024 }, L"Hello, World!");
-	window->set_content(text_block);
+	window->set_content(
+		mnew(mh_box)
+			mslot(mh_box)
+			[
+				button
+			]
+			mslot(mh_box)
+			[
+				button2
+			]
+	);
 
 	mirage_app::get().run();
 	return 0;
diff --git a/src/mirage_widget/widget/compound_widget/mbutton.cpp b/src/mirage_widget/widget/compound_widget/mbutton.cpp
index 17d6839..007596d 100644
--- a/src/mirage_widget/widget/compound_widget/mbutton.cpp
+++ b/src/mirage_widget/widget/compound_widget/mbutton.cpp
@@ -7,6 +7,8 @@
 
 mbutton::mbutton() {
 	color_ = {0.5, 0.5, 0.5, 1};
+	slot_.h_alignment(horizontal_alignment_t::center);
+	slot_.v_alignment(vertical_alignment_t::center);
 }
 
 void mbutton::init() {