"У кожного є свій власний стиль."
Переклад:Everyone has their own style.
Знайшла цілих два пояснення: "...everyone and everybody are grammatically singular but notionally plural. Their natural tendency is to take singular verbs and plural pronouns"
Або: https://en.wikipedia.org/wiki/Singular_they (Singular they is the use in English of the pronoun they as a "pronoun that is neutral between masculine and feminine")