vitra single button cistern lid won't come off

[Maggie]

Just move to a new place, toilet flush not enough water. Try to take off the lid to see vit it won't come off. Toilet has the word Vitra on it. Already unscrewed the single button off but the lid seems stuck or glued. Not even move slightly. Anyone have idea want else I could do please? Thanks

 

[ShaunCorbs]

Probably wedged try pulling up from the front don’t drop the lid