Remeber that filling out a contact form is not a task to dream about. Narrow a number of optional fields to a minimum (close to 0).
It is an excellent practice to connect the required field indicators with a label. It is excellent both from the viewpoint of semantics and accessibility.

Name*

Email*

Your request*

Field width

Name

Last name

Email*

Phone*

Incorrectly sized fields make the process uncomfortable.

Name

Last Name

Email*

Phone*