Header with

Hi Jenny,

The Top bar in the link you attached can be replicated through clipping: https://ishadeed.com/article/clip-path/

Here is a custom CSS you may try:

nav#secondary-navigation {
    background: white;
}

.inside-navigation.grid-container.grid-parent {
    background-color:var(--global-color-8);
    clip-path:polygon(35% 0, 100% 0, 100% 100%, 45% 100%);
}

Kindly modify the clip-path values to your preference.

Here is an article with regards to adding CSS: https://docs.generatepress.com/article/adding-css/#additional-css

Adding it through additional CSS should work.

Hope this helps! :)