body {
  background:rgb(204,204,204);
  display:grid;
  font-size:12pt;
  grid-template-columns:1 / -1;
  height:100%;
  justify-content:center;
  justify-items:center;
  line-height:1.4;
  margin:0 auto;
  padding:0;
  width:300mm;
}
* {
  box-sizing:border-box;
  -moz-box-sizing:border-box;
}
.main-page {
  margin:10mm auto;
  background-color:white;
  box-shadow:0 0 0.5cm rgba(0,0,0,0.5);
}
.sub-page {
  padding:1cm;
}
.page-PageSizeA4-PageOrientationPortrait {
  height:297mm;
  width:210mm;
  /* ExplanationNote: to bind the paper for easy writing. */
  margin-top:1cm;
}
.page-PageSizeA4-PageOrientationLandscape {
  height:210mm;
  width:297mm;
}
@page {
  margin:0;
}
@media print {
  .main-page {
    padding:0;
    margin:0;
    border:initial;
    border-radius:initial;
    width:initial;
    min-height:initial;
    box-shadow:initial;
    background:white;
    page-break-after:always;
  }
}