About Custom CSS for the header

I am still a beginner.
I want to change the font of the global navigation in the header, but I could not do it with the standard changes.
It appears that a previous user has added custom CSS.
If I go to Design > Custom CSS and manually delete all the custom CSS, can I change the font? 

The header content has changed from that created by the predecessor.

Any advice would be appreciated.

Hi,

What is site url?

Change font, you mean font name or?

Thanks for the response.

https://www.vincerojp.com
I cannot change the header font from "Home" to "ARCHIVES" on the above site.
I guess it is due to Custom CSS, but I am a newbie and can't solve the problem, so I am posting.

On 3/9/2023 at 9:11 AM, FY_TOKYO said:

Thanks for the response.

https://www.vincerojp.com
I cannot change the header font from "Home" to "ARCHIVES" on the above site.
I guess it is due to Custom CSS, but I am a newbie and can't solve the problem, so I am posting.

You mean change font name (font family)? Just remove this code from CSS box

(remember save a copy of all CSS somewhere, just for backup)

.header-nav *, nav.header-menu-nav-list * {
    font-family: Bebas neue;
}

and this from Page Header or Code Injection

.header-nav * {
    font-family: itc-avant-garde-gothic-pro!important;
}
.header-nav *, nav.header-menu-nav-list * {
    font-family: itc-avant-garde-gothic-pro!important;
}

I always appreciate your kind advice.

I was able to change the header font, but I will try more.