Removing Sidebar from posts.

Is there any specific Styling Code to remove the sidebar from all the posts. I attempted to use this but to no avail:

.post #sidebar {
display: none;
}

Thanks!

 

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

.sidebar {
display: none;
}

 

Hi again! I did this, but now my blog posts are still the same width and there is a big blank area where the sidebar used to be. Any way I can make the blog post pages to be just one column? Or full-width? Or whatever it's called???

Thank you!
http://gretchenwillisphotography.com

 

^^ Never mind, I read through the questions on the support forum here, and I got it figured out! Thanks anyway!!

BTW really clear instructions and you guys totally rock at answering all the questions!!!