xyflow/src/style.css

.react-flow {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.react-flow__renderer,
.react-flow__zoompane,
.react-flow__selectionpane {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.react-flow__zoompane {
  z-index: 1;
}

.react-flow__selectionpane {
  z-index: 2;
}

.react-flow__selection {
  position: absolute;
  top: 0;
  left: 0;
  background: rgba(0, 89, 220, 0.08);
  border: 1px dotted rgba(0, 89, 220, 0.8);
}

.react-flow__edges {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 2;
}

.react-flow__edge {
  pointer-events: all;

  &.selected {
    .react-flow__edge-path {
      stroke: #555;
    }
  }

  &.animated path {
    stroke-dasharray: 5;
    animation: dashdraw 0.5s linear infinite;
  }
}

@keyframes dashdraw {
  from {
    stroke-dashoffset: 10;
  }
}

.react-flow__edge-path {
  fill: none;
  stroke: #bbb;
  stroke-width: 2;
}

.react-flow__edge-text {
  font-size: 12px;
  pointer-events: none;
  user-select: none;
}

.react-flow__edge-textbg {
  fill: white;
}

.react-flow__connection {
  pointer-events: none;
}

.react-flow__connection-path {
  fill: none;
  stroke: #ddd;
  stroke-width: 2;
}

.react-flow__nodes {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
  transform-origin: 0 0;
  z-index: 3;
}

.react-flow__node {
  position: absolute;
  user-select: none;
  pointer-events: all;
  transform-origin: 0 0;
  cursor: grab;
}

.react-flow__node-default,
.react-flow__node-input,
.react-flow__node-output {
  padding: 10px;
  border-radius: 5px;
  width: 150px;
  font-size: 12px;
  color: #222;
  text-align: center;

  &.selected,
  &.selected:hover {
    box-shadow: 0 0 0 2px #555;
  }

  &:hover {
    box-shadow: 0 1px 5px 2px rgba(0, 0, 0, 0.08);
  }
}

.react-flow__node-default {
  background: #ff6060;
}

.react-flow__node-input {
  background: #9999ff;
}

.react-flow__node-output {
  background: #55dd99;
}

.react-flow__nodesselection {
  z-index: 3;
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  transform-origin: left top;
  pointer-events: none;

  &-rect {
    position: absolute;
    background: rgba(0, 89, 220, 0.08);
    border: 1px dotted rgba(0, 89, 220, 0.8);
    pointer-events: all;
  }
}

.react-flow__handle {
  position: absolute;
  width: 10px;
  height: 8px;
  background: rgba(255, 255, 255, 0.4);
  cursor: crosshair;
}

.react-flow__handle-bottom {
  top: auto;
  left: 50%;
  bottom: 0;
  transform: translate(-50%, 0);
}

.react-flow__handle-top {
  left: 50%;
  top: 0;
  transform: translate(-50%, 0);
}

.react-flow__handle-left {
  top: 50%;
  left: 0;
  transform: translate(0, -50%);
}

.react-flow__handle-right {
  right: 0;
  top: 50%;
  transform: translate(0, -50%);
}