2020 CSS Starter

starter.css

html {
  box-sizing: border-box;
}
*, *:before, *:after {
  box-sizing: inherit;
}
html:before {
  padding: 200px;
  position: fixed;
  background-color: #222;
  color: #fff;
  font-size: 50px;
  font-family: sans-serif;
  height: 100%;
  width: 100%;
  content: 'You are using an outdated browser. Try latest Firefox, Opera, Chrome, Edge, or Safari.';
  z-index: 9999999999;
}
@supports (grid-area: auto) {
  html:before { display: none; }
}
body {
  margin: 0;
  width: -moz-fit-content;
  width: fit-content;
  min-height: 100vh;
  min-width: 100vw;
}