xyflow/packages/system/src/styles/style.css

.xy-flow {
  --xy-node-color-default: inherit;
  --xy-node-border-default: 1px solid #1a192b;
  --xy-node-background-color-default: #fff;
  --xy-node-group-background-color-default: rgba(240, 240, 240, 0.25);
  --xy-node-boxshadow-hover-default: 0 1px 4px 1px rgba(0, 0, 0, 0.08);
  --xy-node-boxshadow-selected-default: 0 0 0 0.5px #1a192b;
  --xy-node-border-radius-default: 3px;

  --xy-handle-background-color-default: #1a192b;
  --xy-handle-border-color-default: #fff;

  --xy-selection-background-color-default: rgba(0, 89, 220, 0.08);
  --xy-selection-border-default: 1px dotted rgba(0, 89, 220, 0.8);

  --xy-controls-button-background-color-default: #fefefe;
  --xy-controls-button-background-color-hover-default: #f4f4f4;
  --xy-controls-button-color-default: inherit;
  --xy-controls-button-color-hover-default: inherit;
  --xy-controls-button-border-color-default: #eee;
  --xy-controls-box-shadow-default: 0 0 2px 1px rgba(0, 0, 0, 0.08);
}

.xy-flow.dark {
  --xy-node-color-default: #f8f8f8;
  --xy-node-border-default: 1px solid #3c3c3c;
  --xy-node-background-color-default: #1e1e1e;
  --xy-node-group-background-color-default: rgba(240, 240, 240, 0.25);
  --xy-node-boxshadow-hover-default: 0 1px 4px 1px rgba(255, 255, 255, 0.08);
  --xy-node-boxshadow-selected-default: 0 0 0 0.5px #999;

  --xy-handle-background-color-default: #bebebe;
  --xy-handle-border-color-default: #1e1e1e;

  --xy-selection-background-color-default: rgba(200, 200, 220, 0.08);
  --xy-selection-border-default: 1px dotted rgba(200, 200, 220, 0.8);

  --xy-controls-button-background-color-default: #2b2b2b;
  --xy-controls-button-background-color-hover-default: #3e3e3e;
  --xy-controls-button-color-default: #f8f8f8;
  --xy-controls-button-color-hover-default: #fff;
  --xy-controls-button-border-color-default: #5b5b5b;
  --xy-controls-box-shadow-default: 0 0 2px 1px rgba(0, 0, 0, 0.08);
}

.xy-flow__edges svg {
  overflow: visible;
  position: absolute;
  pointer-events: none;
}

.xy-flow__edge {
  &.updating {
    .xy-flow__edge-path {
      stroke: #777;
    }
  }

  &-text {
    font-size: 10px;
  }
}

.xy-flow__node.selectable {
  &:focus,
  &:focus-visible {
    outline: none;
  }
}

.xy-flow__node-input,
.xy-flow__node-default,
.xy-flow__node-output,
.xy-flow__node-group {
  padding: 10px;
  border-radius: var(--xy-node-border-radius, var(--xy-node-border-radius-default));
  width: 150px;
  font-size: 12px;
  color: var(--xy-node-color, var(--xy-node-color-default));
  text-align: center;
  border: var(--xy-node-border, var(--xy-node-border-default));
  background-color: var(--xy-node-background-color, var(--xy-node-background-color-default));

  &.selectable {
    &:hover {
      box-shadow: var(--xy-node-boxshadow-hover, var(--xy-node-boxshadow-hover-default));
    }

    &.selected,
    &:focus,
    &:focus-visible {
      box-shadow: var(--xy-node-boxshadow-selected, var(--xy-node-boxshadow-selected-default));
    }
  }
}

.xy-flow__node-group {
  background-color: var(--xy-node-group-background-color, var(--xy-node-group-background-color-default));
}

.xy-flow__nodesselection-rect,
.xy-flow__selection {
  background: var(--xy-selection-background-color, var(--xy-selection-background-color-default));
  border: var(--xy-selection-border, var(--xy-selection-border-default));

  &:focus,
  &:focus-visible {
    outline: none;
  }
}

.xy-flow__handle {
  width: 6px;
  height: 6px;
  background-color: var(--xy-handle-background-color, var(--xy-handle-background-color-default));
  border: 1px solid var(--xy-handle-border-color, var(--xy-handle-border-color-default));
  border-radius: 100%;
}

.xy-flow__controls {
  box-shadow: var(--xy-controls-box-shadow, var(--xy-controls-box-shadow-default));

  &-button {
    border: none;
    background: var(--xy-controls-button-background-color, var(--xy-controls-button-background-color-default));
    border-bottom: 1px solid
      var(
        --xy-controls-button-border-color-props,
        var(--xy-controls-button-border-color, var(--xy-controls-button-border-color-default))
      );
    color: var(
      --xy-controls-button-color-props,
      var(--xy-controls-button-color, var(--xy-controls-button-color-default))
    );
    cursor: pointer;
    user-select: none;

    &:hover {
      background: var(
        --xy-controls-button-background-color-hover-props,
        var(--xy-controls-button-background-color-hover, var(--xy-controls-button-background-color-hover-default))
      );
      color: var(
        --xy-controls-button-color-hover-props,
        var(--xy-controls-button-color-hover, var(--xy-controls-button-color-hover-default))
      );
    }

    &:disabled {
      pointer-events: none;

      svg {
        fill-opacity: 0.4;
      }
    }
  }

  &-button:last-child {
    border-bottom: none;
  }
}