@headwire/jsonforms-react-spectrum-renderers/lib/src/complex/array/SpectrumArrayItem.css

React Spectrum Renderer Set for JSONForms

.spectrum-array-item-number {
  --spectrum-array-item-number-size: 1.2rem;

  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--spectrum-array-item-number-size);
  height: var(--spectrum-array-item-number-size);
  border-radius: 50%;
  overflow: hidden;
  line-height: var(--spectrum-array-item-number-size);
  font-size: 0.75em;
  font-weight: 500;
  text-align: center;
  background-color: var(--spectrum-global-color-gray-500);
  color: var(--spectrum-global-color-gray-200);
}