[FEATURE]: Create and Display Page Margins

[Gazook89]

If a user wants to submit their brew to a physical printer, they'll typically run into a requirement for some sort of page margin/bleed (generally .125") or risk having white borders around their pages. It'd be neat to allow adding bleed to a brew. I think this gets tricky with pdf generation though, so maybe not worth tackling?

Here is a Share link for some CSS that would do the trick of allowing a variable margin size, adds a red border where the bleed begins, and automatically adjusts the footer graphic for PHB 5e and the page padding.

To print the PDF, I believe you have to use the system print dialog rather than Chrome's. And use a Custom Size Document, and set the size equal to your page height and width size + 2*margins.

Perhaps a better way to do this exists with JS or something, but this is what I've got.

:root {
	--margin:.25in;	
}

.phb {
	width:calc(8.5in	+ 2 * var(--margin));
	height:calc(11in	+ 2 * var(--margin));
	padding: calc(1cm + var(--margin)) calc(1.7cm + var(--margin));
	padding-bottom:calc(1.5cm + var(--margin));
	transform:scale(.5)
}

.phb:after {
	bottom:0;
	background:url(https://i.imgur.com/M7yy5E6.png);
	height:calc(.7in + var(--margin));
	width:calc(8.5in + 2 * var(--margin));
	background-size:9.5in;
	background-repeat:no-repeat;
	background-position:top center
}

.phb:before {
	content:'';
	width:8.5in;
	height:11in;
	border:1px solid red;
	position:absolute;
	left:var(--margin);
	top:var(--margin);
	box-sizing:border-box;
	z-index:500;
}

[5e-Cleric]

This should be fixed with #3190, linking issues for future reference.

[dbolack-ab]

Anyone going to print from here should be using a full PDF/X print driver...

[dbolack-ab]

This should probably be solved at a document level with CSS variables rather than fixed values. IME, bleed changes from printer to printer and print format to print format.