We can spcify the width and height of the page size with in the body tag.
For example to make a page size Width : 14.6 cm and Length : 20.8 cm.
We can covert either the cm to inches or millimeters or inches. Then specify the height and width inside the body tag.
<body width = “5.74in” height=”8.188in”.
We can also give the size as landscape along with this.