Website Background image

Layout > Site > Layout (Boxed) > Add the background image there.

Troubleshooting

For the site in question, replace the current custom CSS you are using by the following CSS. It should remove the background colors of the headerbar, the navbar, all sections and tiles. The background image should be set in the Layout settings, additionally.

.tm-headerbar-top, .uk-navbar-container:not(.uk-navbar-transparent), .uk-section, .uk-tile {
        background: none;
}