Side bar not responsive

Hi,

I would like the sidebar of my website to show on the mobile site, too. The theme did not show the sidebar by default. In the CSS under responsive I found:
.sidebar { display: none; }

I changed ‘none’ with ‘inline’ (and after a try with ‘right’) but what I got was a partial sidebar showing at the end of the post page.

Is there a way to show the sidebar to the right, as in the website?

Thanks.