fix: adjust dialog action button variant

src/components/setting/setting-theme.tsx

@@ -142,7 +142,9 @@ const SettingTheme = (props: Props) => {
       </DialogContent>
 
       <DialogActions>
-        <Button onClick={onClose}>{t("Cancel")}</Button>
+        <Button variant="outlined" onClick={onClose}>
+          {t("Cancel")}
+        </Button>
         <Button onClick={onSave} variant="contained">
           {t("Save")}
         </Button>