The problem I'm having is that the sidebar of my website is being shown on the right side, even though on the theme's configuration on WordPress dashboard it is set to be on the left.
The problem seemed to arise when I uploaded the header.php file (I'm not sure if it was when I created header.php or when I created style.css). When I inspect the page, the tag that contains the sidebar (widget area) is div#secondary.widget-area.col-sm-12.col-md-4 . However, I can't find this tag neither on the header.php nor the style.css. Does anyone know how to fix the problem?