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CSS

width: 500px;
height: 500px;
background:
  conic-gradient(from -45deg at 50% 50%, rgb(255 69 69 / 1) 24%, rgb(245 21 21 / 1) 25%, rgb(217 10 10 / 1) 49%, rgb(193 7 7 / 1) 50%, rgb(193 7 7 / 1) 74%, rgb(175 4 4 / 1) 75%) 0px 0px / 50px 50px repeat repeat; /* Pyramids */