"How do I change the width of my page?"
Click Edit Style > Page Style and select Full Span so the content of your site fills the entire page horizontally, or Fixed Width to display more background.
When you choose Fixed Width, you can set a background color (theme default or custom) as well as apply a gradient to the selected color.
With Fixed Width selected you also have the option of adding a background image to your entire website. Click Add Background Image to launch the image editor. Select from stock, previously-uploaded or upload a new image. Just as with image blocks you have the option to crop and rotate. Click Save Changes when you are done.
The default transparency of your background image is set to 50%. Drag the transparency slider to the left to show more of the selected background color behind the image. Slide it to the right to show more of the image and less color.
- Fill: background image is tiled once
- Tile: background image is tiled
- Scroll: the background image scrolls along with content
- Fixed: the content scrolls and the background image does not move