body {
/* https://www.smashingmagazine.com/2015/11/using-system-ui-fonts-practical-guide/ */
font-family:
system-ui, -apple-system, BlinkMacSystemFont,
"Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans",
"Helvetica Neue", sans-serif;
}