Your child theme style.css is fine.
By seeing your code it seems like there must be sidebar present that you have added, in the back-end.
But for appearing sidebar( widgets) at the front-end, overriding templates files will work but doesn’t work for hooks files and folder( however it will work on pro version http://www.acmethemes.com/themes/corporate-plus-pro/ ),for the hooks file you need to remove_action of parent theme, then add child theme action by add_action.
( The solution given by Acme Supports will work on Pro version only, because in pro version you can even override each and every folder and files inside acmethemes/ folder expect init.php ).
Please use remove_action and add_action for removing hooks and adding hooks for now.