Less
Define style at parent or child

by Benny Neugebauer

.start-ui-list-wrapper {
  display: flex;
  overflow: hidden;
  flex: 1 1;
  flex-direction: column;
  &.split-view,
  &.split-view .start-ui-list {
    overflow: hidden;
    flex: unset;
  }
}

.start-ui-list {
  position: relative;
  flex: 1 1;
  overflow-x: hidden;
  overflow-y: scroll;
}

.start-ui-list-wrapper {
  display: flex;
  overflow: hidden;
  flex: 1 1;
  flex-direction: column;
  &.split-view {
    flex: unset;
  }
}

.start-ui-list {
  position: relative;
  flex: 1 1;
  overflow-x: hidden;
  overflow-y: scroll;
  .split-view & {
    overflow: hidden;
    flex: unset;
  }
}