body {
  background-image: url('https://previews.123rf.com/images/bellanatella/bellanatella1701/bellanatella170100038/69877918-abstract-vector-seamless-op-art-pattern-monochrome-graphic-black-and-white-ornament-striped.jpg');
  background-repeat: repeat;
  background-size: auto;
}
body {
  color: blue;
}