I appreciate your feedback. I've made further adjustments to the code to address the issues with the placement of AD to BS and BS to AD options, as well as ensuring proper selection highlighting. The result will now be displayed in a box similar to the input fields. Please take a look at the updated code:
```html
Date Converter
```
This should provide a more cohesive layout on mobile devices, with the AD to BS and BS to AD options properly placed and highlighted. Please give it a try, and let me know if it meets your expectations.
