Hello,
As codex say, it seems that @import is not the best way to import css :
The final step is to enqueue the parent and child theme stylesheets. Note that the previous method was to import the parent theme stylesheet using @import: this is no longer best practice. The correct method of enqueuing the parent theme stylesheet is to add a wp_enqueue_scripts action and use wp_enqueue_style() in your child theme’s functions.php.
So how would you suggest to change the way to import css as it is not very clear for me ?
Thank you.