diff --git a/dislocker_client.py b/dislocker_client.py
index 038954b..1ab3610 100644
--- a/dislocker_client.py
+++ b/dislocker_client.py
@@ -12,6 +12,7 @@ class App(customtkinter.CTk):
         super().__init__()
         self.title("Dislocker ロック中")
         self.attributes('-fullscreen', True)
+        self.attributes('-topmost', True)
         
         self.frame = customtkinter.CTkFrame(self, corner_radius=0, fg_color='transparent')
         self.frame.grid(row=0, column=0, sticky='nsew')
@@ -63,6 +64,7 @@ class Lock(customtkinter.CTkToplevel):
         self.geometry('400x200')
         self.resizable(height=False, width=False)
         self.attributes('-topmost', True)
+        self.grab_set()
         self.lift()
         self.protocol("WM_DELETE_WINDOW", self.handler_close)