#main{
  display:flex;
  flex-direction:row;
  flex:1 1 100%;
}

.b-grid-header{
  height:60px;
}

.b-external-grid{
  flex:0 0 300px;
}
.b-external-grid.b-grid-empty .b-empty-text{
  width:calc(100% - 2em);
  height:calc(100% - 2em);
  display:flex;
  justify-content:center;
  align-items:center;
  font-size:1.3em;
  color:#aaa !important;
  border:2px dashed #aaa;
  margin:1em;
}
.b-external-grid.b-drop-target .b-empty-text{
  border-color:#777;
  color:#777 !important;
}