The :first CSS pseudo-class, used with the @page at-rule, represents the first page of a printed document. (See :first-child for general first element of a node.)
/* Selects the first page when printing */
@page :first {
margin-left: 50%;
margin-top: 50%;
}
Note: You can't change all CSS properties with this pseudo-class. You can only change the margins, orphans, widows, and page breaks of the document. Furthermore, you may only use absolute-length units when defining the margins. All other properties will be ignored.