body {
    background-color: gray;
	/* Use a system font, if none are available use an available sans-sarif   font */
	font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
		Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
	margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  text-align: center;
  color: antiquewhite;
  padding-top: 200px;
  background-image: url(https://files.wallpaperpass.com/2019/10/twin%20peaks%20wallpaper%2020%20-%201920x1080.jpg);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

section.board {
  display: grid;
  grid-template-rows: repeat(3, 10vmin);
  grid-template-columns: repeat(3, 10vmin);
  grid-gap: 0vmin;
  margin: auto;
}

div {
  border: 3px solid black;
  font-size: 8vmin;
  text-align: center;
  vertical-align: middle;
}

#reset-button {
  width: 200px;
  margin: auto;
}