<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<style>
@page
{
size:1600px 1200px;
margin:0;
background:red;
background-image:url(https://convertingcolors.com/images/create_color_images_from_hex_colors_with_php/result_6_colors.png);
background-size: cover;
}
</style>
</head>
<body>
</body>
</html>