How can I center the search bar on both mobile and desktop using the Prestige theme?

Store Design
1

Hello,
I would like to have the search bar in the center both on mobile and desktop. My store is thecopstore.it and I use the prestige theme. I would like the search bar in the center which is mobile friendly I have tried several times but nothing. The search bar must be in the center like on the site below

2

my website https://thecopstore.it/