Hey Csaba,
Glad to hear the theme has come in handy :)
I would highly recommend using a child theme for all changes to the original theme, as outlined in this WordPress guide. A child theme allows you to make unlimited changes to the template files and styles, while preserving the original files – this means that you can update the theme at any time without the risk of losing any of the custom changes being made to it. As a matter of fact, Ikebana also includes a child theme core, which you can find in the “Ikebana-child” folder in the main downloadable ThemeForest archive.
Sincerely,
Andrii / Satori Studio