.send-icon{
  --s: 120px;               /* size */
  width: var(--s);
  height: var(--s);
  position: relative;
}

/* Plane body */
.send-icon::before{
  content:"";
  position:absolute;
  inset: 16% 12% 12% 16%;
  background:#000;
  border-radius: 22px;
  transform: rotate(45deg);
  /* rounded triangular-ish shape */
  clip-path: polygon(12% 16%, 88% 16%, 72% 86%, 12% 86%);
}

/* White diagonal cut + 3 trails */
.send-icon::after{
  content:"";
  position:absolute;
  inset:0;
  background:
    /* white diagonal cut (on the plane) */
    linear-gradient(45deg,
      transparent 0 44%,
      #fff 44% 52%,
      transparent 52% 100%) 56% 40% / 44% 44% no-repeat,

    /* trails (3 rounded strokes) */
    linear-gradient(#000 0 0) 22% 64% / 14% 8% no-repeat,
    linear-gradient(#000 0 0) 18% 76% / 22% 8% no-repeat,
    linear-gradient(#000 0 0) 26% 88% / 18% 8% no-repeat;
  border-radius: 1000px;
}