White rounded shadow on dark background

<div class="item"></div>

.item {
  height: 10rem;
  width: 10rem;
  border-radius: 50%;
  background-color: crimson;
  filter: drop-shadow(0 0 4rem white);
  box-shadow: rgba(0, 0, 0, 1) 0.25rem 0.25rem 10px;
}