diff --git a/src/components/SettingsModal.tsx b/src/components/SettingsModal.tsx
index c95cc72..f9646c8 100644
--- a/src/components/SettingsModal.tsx
+++ b/src/components/SettingsModal.tsx
@@ -258,11 +258,11 @@ export default function SettingsModal({ onClose }: SettingsModalProps) {
                   <button
                     onClick={handleCheckUpdate}
                     disabled={isCheckingUpdate || isDownloading}
-                    className={`px-3 py-1.5 text-xs font-medium rounded-lg transition-all ${
+                    className={`min-w-[88px] px-3 py-1.5 text-xs font-medium rounded-lg transition-all ${
                       isCheckingUpdate || isDownloading
-                        ? "bg-gray-100 dark:bg-gray-700 text-gray-400 dark:text-gray-500 cursor-not-allowed"
+                        ? "bg-gray-100 dark:bg-gray-700 text-gray-400 dark:text-gray-500 cursor-not-allowed border border-transparent"
                         : hasUpdate
-                          ? "bg-blue-500 hover:bg-blue-600 dark:bg-blue-600 dark:hover:bg-blue-700 text-white"
+                          ? "bg-blue-500 hover:bg-blue-600 dark:bg-blue-600 dark:hover:bg-blue-700 text-white border border-transparent"
                           : showUpToDate
                             ? "bg-green-50 dark:bg-green-900/20 text-green-600 dark:text-green-400 border border-green-200 dark:border-green-800"
                             : "bg-white dark:bg-gray-700 hover:bg-gray-50 dark:hover:bg-gray-600 text-blue-500 dark:text-blue-400 border border-gray-200 dark:border-gray-600"