html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  display: grid;
  grid-template-columns: -webkit-min-content 1fr;
  grid-template-columns: min-content 1fr;
  font-family: system-ui, sans-serif;
  
  /* this breaks position sticky in Firefox */
  /* overflow-x: hidden; */
}
header {
  grid-column: 1 / 3;
  background: #455A64;
  color: white;
  padding: 4rem;
  text-align: center;
}
nav {
  white-space: nowrap;
  background: #37474F;
}
nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
/* Only stick if you can fit */
@media (min-height: 300px) {
  nav ul {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
  }
}
nav ul li a {
  display: block;
  padding: 0.5rem 1rem;
  color: white;
  text-decoration: none;
}
nav ul li a.current {
  background: black;
}
main {
  padding-bottom: 40rem;
}
section {
  padding: 2rem;
  margin: 0 0 2rem 0;
}
footer {
  grid-column: 1 / 3;
  background: #607D8B;
  padding: 5rem 1rem;
}