.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
  height: 100%;
}
body {
	background-image: url("./.img/404.png");
	background-position: 50% 0%;
	background-repeat: no-repeat;
	font-family: Helvetica, sans-serif; font-size: 18px; line-height: 24px;
}