Hello Michelle
Well, I'm still doing it my original way. But note that everytime you re-install expose or upgrade it, you will need to change two files.
First, index.php - just below the <body> tag, I created <div class="expose-wrapper">. Of course, closed it just above the </body> tag (bottom) with </div>.
Second, css/responsive.css - edit / change 100px divisions to divisions of 80px (1200px becomes 960px, 1100px becomes 880px, and so on). Work your way through it until you reach 100px which becomes 80px. Do this wherever in the file you see this need. Even the negative values. Usually the value must be input twice. Do not touch the values that are not multiples of 100px.
Third, add .expose-wrapper class to your template.css {max-width:960px;margin:0 auto;}. Max width keeps it responsive and the margin of 0 auto centers it. Don't forget to backup before you upgrade or re-install expose.
If you are using expose framework 4.2 and template 2.7, I've attached the index.php and responsive.css files. Then you don't have to make the changes above. Only add the class to template.css. Please copy to right directory.
I hope this helps.