Thank you for quick response.
Specifically it is the tonytallarico.com web site. I understand that elements on the page might inadvertently push the page wider, but I don't believe this is the case.
Last I left it - the home page (index) was 1084 wide. When I came back at a later time ... it was 1190 wide. Am I doing something (without realizing) to cause the page to grow?