How to create a text input with a bottom line border only (Drag and Drop)

I am trying to replicate the text input box that Thunkable has on their documentation but no matter what settings I change I can’t make the text input only have a bottom line. I know it’s possible since it’s right there on the documentation; I’ve done a lot of Google searching and have come up empty handed. In the StP there was top/bottom/left/right side border which made it easy.

What I am trying to create:

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