Hello
To color of this bar is set by the
Primary Color field in your template settings.
To remove this bar completely you can add the following to the Custom CSS field of your templates parameters (Extensions -> Templates -> [YourTemplateStyle] -> Custom CSS)....
#container_header {
box-shadow: 0 0px 3px
rgba(0,0,0,0.25);
}
#container_header::after {
display: none;
}
Ciaran