Removing "search" "categories" and "archives" from showing up in each page

Because I'm using this theme as a webpage and not a blog, I will not need the "categories" and "archives" widgets that show up on the right side of each page (except the home page). I tried to delete them from the "Widgets" page but that didn't seem to work. The widgets area is now blank but they are showing up. Any way I can change this in the css? Any other suggestions? Screenshot attached of what I want to remove...

 

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

Code:

.sidebar {
display: none;
}