Right Side Bar Widgets

When i put any widget in the sidebar, it expands completely, instead of having its own grid, example: Like Box from Facebook.

Im the home page, the center, where all the posts are located, are inside its own grid, meaning, its not expanded. How can i do this for the sidebar?

Thanks.

Check Image:  https://www.dropbox.com/s/iz5hcqowlqot0fm/example%20grid.png