Hello

To amend you can add the following to the Custom CSS field of your templates parameters (Extensions -> Templates -> [YourTemplateStyle] -> Custom CSS)....

Replace # with the URL to your image...

#container_header, #container_hornav {

    background-color: transparent;

}

#body_panel {

    background-image: url('#');

    background-size: 100%;

    background-repeat: no-repeat;

    background-position-y: 0;

}

.is-sticky #container_hornav {



    background-color: #fff !important;

    background-image: none;



}

Ciarán