We do things.
Very wow.
.el {
  border-image-source: radial-gradient(...);
  border-image-slice: 0 0 100% 0;
  border-image-width: var(--separator-size);
  border-image-outset: var(--separator-size);
  --separator-size: 75px;
  --separator-shadow: 0.35;
  --separator-shadow-color: rgba(0,0,0,0.35);
  --separator-shape: curve-left;
}
@supports (border-image-source: paint(separator)) {
  .el.is-loaded {
    border-image-source: paint(separator)
  }
}