diff --git a/src/main/java/istlab/KisoJikken/App.java b/src/main/java/istlab/KisoJikken/App.java
index 01413f5..1013112 100644
--- a/src/main/java/istlab/KisoJikken/App.java
+++ b/src/main/java/istlab/KisoJikken/App.java
@@ -64,6 +64,8 @@
         SwingUtilities.invokeLater(() -> {
             try {
                 String laf = UIManager.getSystemLookAndFeelClassName();
+                System.out.println(laf);
+                laf = "javax.swing.plaf.metal.MetalLookAndFeel";
                 UIManager.setLookAndFeel(laf);
             } catch (Exception e) {
                 /* Never happens */ }