Stop sidebar disappearing when resizing window

Hi guys,

I’ve been having difficulty with my modern news theme.

Not very experienced with CSS and just want the page to remain stating when resizing the window/browser.

I’ve managed to get the header, menu and home-top widget to remain static by whacking the following in where it seems appropriate:

#MainWrapper {
width: 2000px;
/* you would need to set this to whatever size you wanted your site to be, which would fix the rest of the content with in that */
}

Unfortunately, it won’t work for the sidebar. It disappears when I make the window smaller. This is annoying when viewing on a mobile device.

Anyone know what CSS is can use to stop it disappearing when the window size gets a little smaller?

My website is here: https://benconnormusic.com/

Thanks!!

Ben