Editing CSS

I'm editing my website www.mundozoho.com and I wat to change the background colour of my left sidebar.

I tried to change in Manage-Settings-advanced HTML/CSS the clour of my sidebar, but the button save does not do anything. Changes are not saved.

How could I change the colour to white, or gray, or any other colour?

To make sure I'm doing ok, I attach an image where I'm trying to edit CSS

Thanks.

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