add button default class.

src/page-components/device/BleControl.tsx

@@ -42,6 +42,7 @@ const BleControl: FC = () => {
     <div className={styles.ble_control}>
       {bleState.searching && <span>{searchRemains}s remains</span>}
       <button
+        className="filled"
         disabled={!bleState.ready}
         onClick={() => (bleState.searching ? handleStopScan() : handleStartScan())}>
         {!bleState.searching ? 'Scan' : 'Stop'}