ESS LeaveRequestApprover exit links?

When a MSS user approves leave request from UWL, the last page of the approval says the leave is successfully approved but I cannot see any links or buttons to close the window. I had to close it using browser close button at the top right hand corner cross button.

I have a requirement to add a button or link to close the window, is this possible? If yes, how do I do it?

Thanks

Praveen