Issue with Image, widget, CSS or HTML

Running latest WP and theme ver at fleksjobbernetvaerket.dk As you can se I am using a 'custom html' widget in footer 4, and I combine that content with CSS added in the theme customizewr's 'Extra CSS'-box. The idear is to pressent some text and links on a transperrent picture, in a widget-area. Here you can see the result - look on the right to see the box that says "Sidste Nyt fra ...." with text and link on a LinkedIn picture-background: https://snag.gy/3oL6M7.jpg Question When I see the result via the theme customizer eveything is all right ... When I see the result in the latest Firefox, logged in or out, the first link line is not on the image ... Wot do I do now? thanks Knud