@page {
    size: auto;
    margin: 10mm 10mm 10mm 10mm;
}

/* A4 210x297 mm */
@media print and (min-height: 266mm) and (max-height: 288mm) and
    (min-width: 179mm) and (max-width: 201mm) {
    .img_port {
        height: 267mm !important;
    }
}

.img_port {
    height: 267mm !important;  /* might also try height: 100%; */
    page-break-after: always;
    page-break-before: always;
    page-break-inside: avoid;
}

img{
    page-break-inside: avoid;
    padding:0; margin:0;
    top:0; left:0; right:0;bottom:0;  border:0;
    /*width:2480px; height:3508px!important;*/ /*a4 size */
    width:100%; height:100%; max-width:100% important!
}
.page-break  { display: block; page-break-before: always; }
@page {
size: landscape;
}
@page :first {
  margin-top: 10cm    /* Top margin on first page 10cm */
}