Hide / show the text when the size is selected as "Small".

[MinhTrungNguyen]

Hello everyone.
As the title, I want when the size is selected "Small" will show a line below the button (eg "blablabla"), and when clicking to select another size, the text will be hidden. Can anyone please help me. Thank you very much.

[MinhTrungNguyen]

Website url link: https://pemola.com/ and I am using Booster theme ver 2.