Hi Lea,
In order to differentiate the two buttons, you should use the CSS pseudo class :nth-child(). Worked for me, thanks to Artur’s help, with this use case: New - unofficial - feature: TABS - Hide/Show multiple blocks horizontally
‘#cta3 a[data-element=“button”]:nth-child(1)’ being the first button
‘#cta3 a[data-element=“button”]:nth-child(2)’ being the second button
#cta3 being the ID of the block
Is it an inbox block you’re using? If so, it should work too, I checked in the inspector, buttons are made the same as in a CTA block