That’s not really a header, just a notification or banner
https://wordpress.org/plugins/search/top+banner
https://wordpress.org/plugins/search/top+notification
Oh thanks Steven, I just put it and worked perfectly 🙂
One other question, do you know how can I change the size of the menu text?
Marked in red here:
https://i.imgur.com/gKA07y7.png
Thanks again 🙂
main-navigation {
font-size: 80%;
}
To add or override CSS: use the “Additional CSS” option in the customizer. https://wordpress.org/support/article/appearance-customize-screen/
Learn to use the Chrome Developer Tools or Firefox Developer Tools to help you see and test changes to your CSS.