:right

The :right CSS page pseudo-class matches any right page when printing a page. It allows you to describe the styling of right-side pages.

/* Selects the content on the right-hand pages while printing */
@page :right {
  margin: 2in 3in;
}

Whether the page is left or right is decided by the major writing direction of the document. For example, if the first page has a major writing direction of left-to-right then it will be a :right page and if it has a major writing direction of right-to-left then it will be a :left page.