.layout_root {
  position: relative;
  width: 100%;
  height: 100%;
}

.layout_root.layout_fill_window {
  position: absolute;
}

.layout_root > .layout_box {
  height: 100%;
}

.layout_box {
  position: relative;
  display: -webkit-flex;
  display: flex;
  min-width: 0px;
  flex-grow: var(--flex-grow, 1) !important;
}

.layout_hbox.layout_fill_window {
  -webkit-flex: 1 1 0px;
  flex: 1 1 0px;
}

/* We can't use ':last-child' because of resize-handle elements tacked on beyond it. */
.layout_hbox.layout_last_child {
  -webkit-flex: 1 1 auto;
  flex: 1 1 auto;
}

.layout_vbox {
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-flex: 1 1 0px;
  flex: 1 1 0px;
}

/* not so much to specify the look, as to simplify filtering events */
.layout_leaf {
  -webkit-flex-direction: column;
  flex-direction: column;
}

.layout_new, .layout_trash {
  min-height: 2rem;
  line-height: 2rem;
  padding: 0.5rem 1rem;
  margin: 0.5rem 0;
  cursor: default;
}

.layout_trash:hover, .layout_new:hover {
  background-color: #F8F8F8;
}

.layout_new {
  border-left: 1px solid lightgrey;
  border-top: 1px solid lightgrey;
  border-right: 1px solid grey;
  border-bottom: 1px solid grey;
  color: grey;
}

.layout_trash {
  border: 1px solid lightgrey;
  border-radius: 3px;
  color: red;
}

.layout_leaf_test {
  border-left: 1px solid lightgrey;
  border-top: 1px solid lightgrey;
  border-right: 1px solid grey;
  border-bottom: 1px solid grey;
  color: grey;
  width: 100%;
  -webkit-flex: 1 1 0px;
  flex: 1 1 0px;
  min-height: 5rem;
  line-height: 5rem;
  justify-content: center;
  text-align: center;
}

.layout_leaf_test_big {
  min-height: 7rem;
}

.layout_hidden {
  display: none;
}