How to get rid of label's default borders

How do i make label’s default borders dissapear? Under Contacts i put bottom border under input fileds for text (Your name, your last name, email) so i want only my bottom border to be visible?
Im trying to make something simmilar to this Portfolio project example’s contact:

Here’s my portfolio im working on:

Set the value of border property to 0 to remove the default ones before the border-bottom property.

border: 0;
border-bottom: ...;
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