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Drop down Menu Pushes content down

Please can you help me do this type of menu when clicked on it opens and pushes other content down like on . The menu is at the bottom of the page that the link takes you to with all the questions.

And then at the end, please help me that when a menu is open and I click on a different menu it closes the already open one and then opens the menu that I clicked on.

Please help me. Thank you