Как изменить стрелочку в сортировке?

/* --- Сортировка статей --- */
.sort { list-style: none; padding: 0; margin: 0; }
	.sort > li, .sort { display: inline; }
	.sort > li { margin: 0 0 0 3%; }
	.sort > li a { color: #353535; }
	.sort > li.asc a, .sort > li.desc a { color: #3394e6; }
	.sort > li.asc a:after, .sort > li.desc a:after {
		content: "";
		background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAsBAMAAACj90TiAAAAG1BMVEUAAAAzlOYzlOYzlOYzlOYzlOYzlOYzlOYzlOar6gzlAAAACHRSTlMAjesv90eHRuQt1XUAAABSSURBVBjTzdCxDQAhDENRSyzAEFdQ0zDB9axEgzw2DokEI1A9/S4OyAxADEcpPGlpFKWoSpEKp0Dlb6SvG2jY4Fka4tw4PqbEsDNTcb8gn/d4LPQHQDdjhblbAAAAAElFTkSuQmCC);
		display: inline-block;
		vertical-align: middle;
		margin: -1px 0 0 .4em;
		width: 6px; height: 11px;
		-webkit-background-size: 6px auto; background-size: 6px auto;
	}
	.sort > li.asc a:after { background-position: 0 -11px; }

background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAsBAMAAACj90TiAAAAG1BMVEUAAAAzlOYzlOYzlOYzlOYzlOYzlOYzlOYzlOar6gzlAAAACHRSTlMAjesv90eHRuQt1XUAAABSSURBVBjTzdCxDQAhDENRSyzAEFdQ0zDB9axEgzw2DokEI1A9/S4OyAxADEcpPGlpFKWoSpEKp0Dlb6SvG2jY4Fka4tw4PqbEsDNTcb8gn/d4LPQHQDdjhblbAAAAAElFTkSuQmCC);