Snippet: Add Background Image to Site Header
body #site-header,
body #site-header-sticky-wrapper.is-sticky #site-header {
background: #000 url( 'YOUR_IMAGE_URL' ) repeat;
}Learn how to add custom CSS to your site.
Snippets
body #site-header,
body #site-header-sticky-wrapper.is-sticky #site-header {
background: #000 url( 'YOUR_IMAGE_URL' ) repeat;
}