System font

Is there a way to use system fonts instead of a custom font? I tried this below but I only get sans-serif.

body {
	background: #fff;
	color: #000;
	margin: 0cm;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
	line-height: 1;
	font-weight: normal;
	font-size: 10pt;
}