Hide Slack Sidebar

slack-hide-sidebar.css

/* Based on 0atman's solution
 * http://www.0atman.com/remove-slacks-sidebar.html
 *
 * Thanks to:
 * Tristram Oaten
 * shaymdev
 */

/* Replace max-width with desired value */
@media (max-width: 600px) {
    /* hide the sidebar */
    #messages_container {margin-left: 0;}
    #notification_bar {width: 100vw;}
    .client_channels_list_container { display: none; }

    #channel_header_info { overflow: hidden; }
    
    #client_header {
        min-width: 0;
    }
    
    #client_header .channel_header {
        margin-left: 0;
    }
    
    body {
    	min-width: 0;
    }
}

Thanks, works nicely