Hi Barbara-
Thanks for the great question! In the BoldGrid Florentine theme, this is only possible with Custom CSS. If you’re interested in a Theme that offers complete header customization without the use of any code, I recommend checking out our newest theme, the Crio Supertheme.
If you’d rather stick with Florentine, here’s how you can do it.
First, navigate to Customize > Advanced > Custom JS/CSS and paste this into your Custom Theme CSS:
#masthead aside {
background-color: transparent;
border: none;
}
This will remove the border and make the background transparent, so it will completely blend into your header design.