.paper-header padding: 1.8rem;
Never use a nulled HTML theme. The few dollars you save are not worth your site's security, your visitors' privacy, or a potential lawsuit. Use a legitimate free theme or buy the premium one — both are better in every way.
HTML themes are not static. Browsers update, CSS standards change, and security vulnerabilities are discovered in third-party libraries (like jQuery or Bootstrap). Legitimate theme authors issue updates.