Hi – I realise this has been asked a few times for different themes but I can’t get anything to work! I’m trying to specify an alternate header image for mobile screen widths but everything I try in CSS doesn’t seem to work. I also can’t find any plugins which might be suitable. Has anyone achieved this with Mantra or aware of a plugin?
You can customize the mantra_title_and_description() function (defined in theme-functions.php) via a child theme to make it output an image srcset for the header image (leaving the browser choose the desired image file based on screen size).