.event-span {
  font-size: clamp(.45em, 1.8vh, .75em);
  padding: 0 .5em;
  border-radius: .4em;
  color: var(--strong);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1;         /* let the track height define the visual height */
  height: 100%;           /* fill the grid row height */
  align-self: stretch;    /* fill row vertically */
  justify-self: stretch;  /* stretch across chosen grid columns */
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: auto;   /* clickable despite overlay having none */
  z-index: 1;
}

/* Selection styles */
.cell.selected {
  background: var(--select);
  box-shadow: 0 0 .1em var(--muted) inset;
}
.cell.selected .event { opacity: .7 }