How to create a drop-down box?

[xSuperMario64x]

I want to include a drop-down box for my signature so it's not too tall, but I don't know how to do it. Help is appreciated!

 

[Laudine]

Here, this code should be able to help you Let me know if you need any help though!

[spoiler="insert spoiler name here"]Insert spoiler content here[/spoiler]

It should show up as this:

Spoiler: insert spoiler name here

Insert spoiler content here

 

[xSuperMario64x]

Thank you!