@antv/x6/lib/addon/knob/index.css

JavaScript diagramming library that uses SVG and HTML for rendering.

.x6-widget-knob {
  position: absolute;
  box-sizing: border-box;
  width: 16px;
  height: 16px;
  margin-top: -8px;
  margin-left: -8px;
  cursor: pointer;
  user-select: none;
}
.x6-widget-knob::before,
.x6-widget-knob::after {
  position: absolute;
  transform: rotate(45deg);
  content: '';
}
.x6-widget-knob::before {
  top: 4px;
  left: 4px;
  box-sizing: border-box;
  width: 8px;
  height: 8px;
  background-color: #fff;
}
.x6-widget-knob::after {
  top: 5px;
  left: 5px;
  box-sizing: border-box;
  width: 6px;
  height: 6px;
  background-color: #fca000;
}