/* Drag-over highlight */
.cell-hover {
  background: var(--color-drag-hover);
  z-index: 0;
}
/* Plus-icon on empty cells */
td[data-date]:hover {
  position: relative;
  cursor: pointer;
  box-shadow: inset 0 0 10px 0 rgba(0, 0, 0, 0.1);
}
td[data-date]:hover::before {
  content: "+";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--plus-size);
  height: var(--plus-size);
  font-size: var(--plus-font-size);
  font-weight: bold;
  color: var(--color-plus-icon);
  background-color: var(--color-plus-bg);
  border-radius: 50%;
  pointer-events: none;
}
td[data-date]:active {
  box-shadow: inset 0 0 15px 0 rgba(0, 0, 0, 0.25);
}