html {
  --s: 105px; /* control the size */
  
  background:
    conic-gradient(from 75deg,#b9b9b9   15deg ,#dcdcdc 0 30deg ,#0000 0 180deg,
                              #dcdcdc 0 195deg,#b9b9b9 0 210deg,#0000 0) 
       calc(0.5*var(--s)) calc(0.5*var(--s)/0.577),
    conic-gradient(#b9b9b9   30deg ,#fafafa 0 75deg ,#b9b9b9 0 90deg, #dcdcdc 0 105deg,
                   #fafafa 0 150deg,#dcdcdc 0 180deg,#fafafa 0 210deg,#b9b9b9 0 256deg,
                   #dcdcdc 0 270deg,#b9b9b9 0 286deg,#dcdcdc 0 331deg,#fafafa 0);
  background-size: var(--s) calc(var(--s)/0.577);
  /* 0.577=tan(30deg)*/
}