.slate-sheet-container {
  position: relative;
}
.slate-sheet-container-vline {
  position: absolute;
  width: 0px;
  border-right: 2px  solid transparent;
  height: 100%;
}
.slate-sheet-container-vline:hover {
  border-right: 2px solid #4797F3;
  cursor: col-resize;
}