Sergey Tretyak@serafim619Web developerFollow BadgesProblem Solving CertificationsCertificate: CSS (Basic)VerifiedskillWork Experienceserafim619 has not updated employment details yet.Educationserafim619 has not updated education details yet.LinksLinkedinhttps://www.linkedin.com/in/sergey-tretyak/Githubhttps://github.com/SerafimGray Skillsserafim619 has not updated skills details yet.