letter paper printing css

print.css

    @media print {
      .pagina {
        border: 1px solid black;
        width: 763px;
        height: 988px;
        background-color: lightgray;
        -webkit-box-sizing: border-box;
           -moz-box-sizing: border-box;
                box-sizing: border-box;

        margin: 1px 0 0 1px;
      }
    }