The overall wrapper for the theme is 960 pixels wide–a very common width for web designs because it can be easily divided to make columns.
If you’d like to change the width, you can do that. You’ll need to add this to your custom css:
#wrap,
#footer {
width: 960px;
}
Just change the 960 to the number of pixels wide you’d like to have the content.
That won’t change the width of the inside elements, just the outside ones. To change the inside ones, you’ll have to do a bit more editing. Here are a changes you’ll want to make:
#content {
width: 630px;
}
#sidebar {
width: 300px;
}
#home-posts {
width: 630px;
}
The #content is the main content column on default pages/posts. The #sidebar is the width of the sidebar area. The #home-posts is the spot for posts on your home page.
Do be aware that the home page donation bar and newsletter bar are made with an image that isn’t made to scale so changing the width there will prevent you from using those as they are designed unless you edit the background images.
I hope that helps you out.
Bill