File:Prevalent default paper size.svg - Wikipedia

/*
 * Paper sizes
 *
 * http://www.unicode.org/cldr/charts/latest/supplemental/territory_information.html
 *
 * Default:
 *
 * Countries that (probably) have adopted ISO 216 and are using it primarily:
 *
 */
.landxx
{
   fill:       #4444bb;
}
/*
 * Countries that have adopted ISO 216 and are using it exclusively:
 *
 */
.eu, 
.de, .be, .nl, .no, .fi, .ch, .se, .su /*Soviet Union: */, .eaeu, .hu, .it, .uy, .ar, .br, .es, .at, .ir, .ro, .jp, .dk, .cz, .sk, .il, .pt, .hr, .rs, .sl, .ba, .me, .xk, .mk, .in
{
   fill:       #0000bb;
}
/*
 *
 * Countries that (may) have adopted ISO 216 but are not using it primarily:
 *
 */
.bz, .ca, .cl, .co, .cr, .sv, .gt, .mx, .ni, .pa, .ph, .pr, .ve
{
   fill:       #ff8888;
}
/*
 *
 * Countries that have not adopted ISO 216 and are using US Letter etc. primarily:
 *
 */
.ca
{
   fill:       #ff0000;
}
.us
{
   fill:       #bb0000;
}