Replace PDF CSS with new CSS in template

functions.php

<?php
/**
 * Remove the default PDF stylesheet
 */
remove_action( 'si_head', array( 'SI_PDF', 'si_add_stylesheet' ), 100 );

/**
 * Add a new pdf stylesheet
 */
add_action( 'si_head', '_custom_si_add_stylesheet' );
function _custom_si_add_stylesheet() {
	if ( SI_PDF::want_create_pdf() ) {
		echo '<link rel="stylesheet" id="si-pdf-css" href="' . get_stylesheet_directory_uri() . '/pdf.css" type="text/css" media="all">';
	}
}

pdf.css

body {
	background-color: #FFF;
}
#wpadminbar {
	display: none;
}
#document_wrap {
	border: none;
}
#outer_doc_wrap {
	padding: 0px !important;
}
#doc {
	padding: 0px !important;
}
.header_info,
#logo {
	width: 48%;
}
#header_logo #logo {
	width: 48%;
}
#doc_line_items {
	margin-top: 20px;
}
#header_wrap {
	margin-bottom: 0px;
}
.status_wrap {
	text-transform: uppercase;
	font: bold 1.3em/1.1em;
	letter-spacing: .1em;
	text-align: center;
	color: #FFF;
	background-color: #8CBA52;
	padding: 10px 5px;
	margin-bottom: 30px;
}
#declined_status_wrap {
	background-color: #000;
}
#pending_status_wrap {
	background-color: #FCA428;
}
#line_items_footer {
	margin-top: 25px;
	padding-top: 15px;
	padding-bottom: 16px;
	border-top: 1px solid #eee;
	display: block;
}
#doc_line_items {
	border-top: 1px solid #eee;

}

#footer_wrap {
	padding: 20px 10px;
}
.pdf_line_item {
	padding-right: 3em !important;
	margin-bottom: 1em !important;
}
.line_item_ind_desc {
	font-weight: bold
}
.pdf_child_items {
	padding-left: 25px;
}
.item_with_children {
	padding: 1px 15px;
	background-color: #FAFAFA;

}