atom/static/atom.css

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#root-view {
  height: 100%;
  overflow: hidden;
  position: relative;
}

#root-view #horizontal {
  display: -webkit-box;
  height: 100%;
}

#root-view #vertical {
  -webkit-box-flex: 1;
  display: -webkit-box;
  -webkit-box-orient: vertical;
}

#root-view #panes {
  -webkit-box-flex: 1;
  position: relative;
}

#root-view #panes .column {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  overflow-y: hidden;
}

#root-view #panes .row {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  overflow-x: hidden;
}

#root-view #panes .pane {
  position: absolute;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  box-sizing: border-box;
}