Hide sidebar for small screens

Trying to disable sidebar and increase font for small screens.

A media query has been added to the additional theme style:

@media all and (max-width: 68em) {
    .wp_sidebar { display: none; }
    body { font-size: 20px; }
}

Also added a tag to the header:
<meta name="viewport" content="width=device-width,initial-scale=1">

But such media query is not working. Tell me please how to fix ?

• This topic was modified 3 years, 10 months ago by Steven Stern (sterndata).