Help with line of code

Step 41

To give the fieldset elements a bit of separation, select all but the last fieldset element, and give them a border-bottom of 3px solid #3b3b4f.

My line of code.

fieldset:not(:last-of-type) {

border-bottom: 3px solid #3b3b4f;

}

worked it out there was an error on how the question presented itself.