Hi danwedd – it would helpful to have a link to your site, as the CSS will depend on your specific header image.
For example, adding this to your custom CSS would override the cover value for background-size:
.header-background {
background-size: auto;
}
But you might also need some additional CSS to incrase the height of the whole site-header element – it really depends on your header image.
Is your site live, and could we see a link?
Or if it’s not live, could you link to your header graphic file?
The usual caveat about custom CSS applies:
Don’t edit the theme files directly, otherwise your changes will be overwritten every time the theme is updated to the latest version.
An easy way to add custom CSS is to install the Jetpack plugin and activate the Custom CSS module. You’ll then add your custom CSS in the new stylesheet editor that’ll appear in your dashboard, under Appearance > Edit CSS.
As alternatives, you could either install a standalone custom CSS plugin, or create a child theme.
