How to reset/clear the attributes of a HTML button

I need to style my HTML buttons. I remember there was a way to wipe out all its current attributes like its bevel, color, etc. so I can start from a clean slate. I remember it was so simple, but I just can't remember the word. No luck googling it because I apparently have totally forgotten it that I'm keying in the wrong search terms. All I remember now is that there is such a thing.

Any help would be appreciated. Thanks in advance!