Hi. You need to override the print styles found in shared.css in the custon quote templates theme. I would recommend creating a stylesheet specifically for that template and then paste this code at the bottom of the stylesheet. This should get you close.
/*
#######################
PRINT
#######################
*/
@media print {
/* Size needs to be A4 */
@page {
size: A4;
margin: 0;
}
html,
body {
overflow: visible !important;
/*
override the default body width and height
width: 215.9mm!important;
height: 279.4mm!important;
*/
width: 100%;
height: 100%;
padding:0;
margin: 0;
-webkit-print-color-adjust: exact !important;
/* may need to adjust body font size when printing */
font-size:12px;
}
}