Ninja forms styling for input fields - Which is the right CSS to use?

It’s ok!! thank you very much to the community here, esp Salim. I just figured out how to do it!! I used a CSS live editor and managed to figure out the right selector to use.

thanks everyone for helping! i really appreciate it!!

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But I do have one last question. When inserting the CSS codes in my stylesheet, can I add notes so that I know what the id is for?

for eg, this is the CSS code I used:

@media screen and (min-width: 768px) {
#nf-field-19 {
width: 50%;
}
}

Note: #nf-field-19: registration form > last name > input field

The note (in bold) is just for my reference. Can I insert into my stylesheet?