background.css

body {
  background-blend-mode: multiply, multiply, normal, normal;
  background-color: #772953;
  background-image: linear-gradient(to bottom left, rgba(119,41,83,0.16) 0, rgba(119,41,83,0.16) 49.9%, transparent 50%),linear-gradient(to bottom right, rgba(228,228,228,0.5) 0, rgba(228,228,228,0.5) 49.9%, transparent 50%),linear-gradient(to top left, #fff 0%, #fff 49.3%, rgba(255,255,255,0) 50%, rgba(255,255,255,0) 100%),linear-gradient(-89deg, #000000 0%, #772953 42%, #2c001e 94%);
  color: #fff;
  background-position: top right, top left, right bottom -1px, left top;
  background-repeat: no-repeat;
  background-size: 74% 99.83%, 68% 91%, 103.8% 20.26%, 100% 99.8%;
}