A light shine is drawn on the front face of each letter, inset by the margin and sized and rounded by the controls. It follows the letter outline rather than sitting as a separate offset copy, so it reads as a reflection on the face.
Drag a slider to see what each control does to the type.
Highlight is applied as an Illustrator live effect, so the text stays editable. Change the word, the font, or any slider afterwards, and save the result as a Graphic Style to reuse it.