Sorry for the inconvenient, it was a correction as the quantity field is in a div it was a logical and necessary correction for the general structure.
Now,
I will show you how to redefine the display according to your needs. 1.
Learn here how to add your css, I suggest to maybe create a custom_style file in order to keep this command even if you update your HikaShop. 2. The Css command to add :