such as changing the color of conetendor for a single page?

You can use our Simple CSS plugin: https://wordpress.org/plugins/simple-css/

It adds a metabox to the edit pages area of your admin where you can add CSS for that specific page.

Which container are you wanting to change the color of? The main container of the site?

Hello Tom

Attached image, in this case is to change the background color of the container in contact page

http://www10.zippyshare.com/v/2pUxXOGD/file.html

Thanks

So you would do something like this in the Simple CSS metabox:

.separate-containers .inside-article {
    background-color: #FFFFFF;
}

Adjust the color as needed :)

Hello Tom,

this code I change the color of the container of all pages, I just want to change the color of the container of contact page, the other pages not

Thank you

You don't want to add it to the "Appearance > Simple CSS" page - you want to add it to the Simple CSS metabox present when you're editing that specific page.

It's the 4th screenshot down: https://wordpress.org/plugins/simple-css/screenshots/

Hello Tom,
sorry, I had not understood, now works but I get error with a jetpack module, attached image.

http://www46.zippyshare.com/v/67JKEiB8/file.html

Not sure what would cause that - maybe try deactivating the Custom CSS Jetpack module?