Toilet Tank Leak - please help
My toilet tank has a constant leak. The leak is coming out between the blue cap & white pipe (attached image).
Can anyone advise on what parts I need to buy or to replace ?
(I have tried using a screwdriver to tighten/loosen the green marked area, the sound changes but there is still a constant leak.)
Thank you so much!
10 second video & sound of leak:
Attached Image Below: