body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.42857143;
  color: #333;
  background-color: #000;
  background: url(https://images.cnblogs.com/cnblogs_com/seakt/686731/o_4c5fa93c12a773ef3fca82220dc5bbfd.jpg) top center repeat;
}