page rules

`@page` rule defines the dimension of the page which is gonna be printed. There are a few important things that should be under control when you want to print a web page those are listed below: The page size, orientation, margins, border, and padding
```css
/* Printing */
page {
  background: white;
  display: block;
  margin: 0 auto;
  margin-bottom: 0.5cm;
}

page[size="A4"] {  
  width: 21cm;
  height: 29.7cm; 
}

@page {
   size: 21cm 29.7cm;
   padding: 0;
   margin: 0mm;
   border: none;
   border-collapse: collapse;
}
/* End Printing */
```