How do I create a drop down menu off the side bar main menu with html

[Luke Joseph]

I have created a sliding side bar menu with main menu heading tabbs as per the attachment below in HTML. Now I want to change the menu headings to a drop down box 9when clisked on)with other dxp page optionsthat we can click on and go to without changing the layout of the sliding menu bar.

Can somone help with the HTML code to create this please

Code below;

 

 

 

 

 

 

 

 

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