/* Define the "system" font family */
@font-face {
  font-family: system;
  font-style: normal;
  font-weight: 300;
  src: local(".SFNSText-Light"), local(".HelveticaNeueDeskInterface-Light"), local(".LucidaGrandeUI"), local("Ubuntu Light"), local("Segoe UI Light"), local("Roboto-Light"), local("DroidSans"), local("Tahoma");
}

/* Now, let's apply it on an element */
body {
  font-family: "system";
  background: #efefef;
}
div.container{
	display: flex;
	flex-direction: column;
	justify-content: space-around;
	margin: 0 auto;
	width: 100%;
	max-width: 800px;
	text-align: center;
	min-height: 100vh;
}
div#header{
}