html, body {
  height: 100%;
}

body {
  display: grid;
  grid: 200px / 655px;
  place-content: center;
  margin: 0;
  background: #FBFBFD;
}

span {
  --size: 50px;
  width: var(--size);
  height: var(--size);
  border-radius: 10px;
  offset: path("M128 1c170 0 230 200 400 200S698 1 528 1 298 201 128 201-42 1 128 1");
  background: #616AFF;
}