.collection-fields-grid-container {
  bottom: 0;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  overflow-x: hidden;
  overflow-y: auto;
}

.collection-fields-grid-container .grid-header {
  color: rgba(0, 0, 0, .55);
  color: var(--text-secondary-color,rgba(0, 0, 0, .55));
  /* omitting this causes grid header titles to overlap in Edge and IE */
  position: relative;
}

.collection-fields-grid-container .ms-DetailsRow-cell {
  color: rgba(0, 0, 0, .55);
  color: var(--text-secondary-color,rgba(0, 0, 0, .55));
}