* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --red: #ff0000;
  --bg: #ffffff;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
          Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
}

html, body {
  height: 100%;
}

body {
  background-color: var(--bg);
  font-family: var(--font);
}