HI,
When you are changing default theme or creating new template need to keep track of changes done.
Because of some change design get distrub so we can roll back that change.
Do you remember the change before graphic in front office working?
PrestaShop Tutorials Videos [How to do Tasks]
https://www.prestashop.com/forums/topic/907438-prestashop-tutorials-videos-how-to-do-tasks/