substance/packages/split-pane/_split-pane.css

Substance is a JavaScript library for web-based content editing. It provides building blocks for realizing custom text editors and web-based publishing systems.

.sc-split-pane {
  display: flex;
  flex-flow: row nowrap;
  /* Serves as anchor for absolute positioning for child components */
  position: absolute;
  left: 0px;
  right: 0px;
  top: 0px;
  bottom: 0px;
}
.sc-split-pane.sm-horizontal { flex-flow: column nowrap; }
.sc-split-pane > .se-pane { position: relative; }
/* This should be fixed according to the configured size (set directly
on the element). Size can either be a percentage or px value.
Don't grow, don't shrink, use width or height for size determination */
.sc-split-pane > .se-pane.sm-sized { flex: 0 0 auto; }
/* Just grow and take up the rest of the available space */
.sc-split-pane > .se-pane.sm-auto-fill { flex-grow: 1; }