.node-resize-handle{
  position:absolute; right:0; bottom:0; width:15px; height:15px; cursor:nwse-resize; opacity:.5;
  background: linear-gradient(135deg, transparent 0 40%, #888 40% 46%, transparent 46% 54%, #888 54% 60%, transparent 60%);
}
.node-resize-handle:hover{ opacity:1; }
.node-resize-handle:focus-visible{ opacity:1; outline:2px solid #00E676; outline-offset:2px; }