CSS sidebar using Woo Canvas

Hi.

One of the websites I run still uses the Woo Canvas theme, which I have a lifetime license for. I’ve tried submitting a request in my Woo Commerce account, however, the form does not work to submit a request.

I’m trying to make a sidebar sticky with just CSS. I don’t want to use JS or a plugin.

I’ve been trying css code such as:

.sidebar {
position: -webkit-sticky;
position: sticky;
top: 0;
}

However, this does not make the sidebar sticky.

I cannot work out which classes or selectors to target in the CSS.

Please can you let me know how to achieve a sticky sidebar using custom CSS in Canvas?

Many thanks.