Hope you are having a good
Such changes require customization in the template files, doing this only with CSS needs excessive modification for desktop, for tablets and for mobile devices, the separate code must be created for each device screens
Thank you very much for the quick answer. Which part of the template should be modified? Is it a fairly easy change? Or will it also lead to a lot of css modification?
" Is it a fairly easy change? Or will it also lead to a lot of css modification?" - depends on your knowledge,not only layout but you have also create new css rules for new layout, you need to deal with header.php