Content can have width of 100% or 50%. Width of 100% means that the content would occupy the whole available page width. Width of 50% means that the content would occupy 50% of the available page width. This is a very powerful means to position the content on the page.
Content Location On Page
Next to each Content on the page (except the first one) there is a 'Up Greeen Arrow'. Clicking on it would move it up.