.root {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: flex-start;
  align-items: stretch;
  align-self: stretch;
  height: 100vh;
  position: relative;
}

.pane {
  flex-grow: 1;
  flex-basis: auto;
  transition: all 1s linear;
  position: relative;
  border-right: 1px solid transparent;
  padding: 0 1rem;
}

.pane:not(.paneCollapsed) + .paneCollapsed {
  border-left: 1px solid #ccc;
}

.paneCollapsed {
  composes: pane;
  flex-grow: 0.0001;
  flex-basis: 2.5rem;
  border-right: 1px solid #ccc;
  overflow: hidden;
  padding: 0 0.5rem;
  padding-left: 0;
}