Step 40 create a form with html css

error saying i need to add padding of 2rem to top and bottom of fieldset . below is the code i wrote explain where is wrong ive tried everything

fieldset {
border: 0;
top-padding: 2rem;
bottom-padding: 2rem;
left-padding: 0;
right-padding: 0;
}

First of all, please always provide a link to the challenge so we can better help.

Secondly, “top-padding” is not a valid CSS property. Hint: You’ve got it backwards.