diff --git a/.gitignore b/.gitignore
index 59bdf5854..d885dff6c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -72,3 +72,5 @@ site/
 
 .yarn
 ui-tests/.yarn
+
+js/less/bqplot.tmp.less
diff --git a/js/less/bqplot.less b/js/less/bqplot.less
index 74b953460..aed588ba6 100644
--- a/js/less/bqplot.less
+++ b/js/less/bqplot.less
@@ -113,11 +113,11 @@
   --bq-plotarea-background-fill: var(--jp-layout-color1);
 }
 
-[data-jp-theme-light='false'] .bqplot .linkarrow {
+[data-jp-theme-light='false'] .bqplot_@{version} .linkarrow {
   fill: var(--bq-linkarrow-fill-light);
 }
 
-[data-jp-theme-light='false'] .bqplot .network .node .label {
+[data-jp-theme-light='false'] .bqplot_@{version} .network .node .label {
   --bq-network-node-label-text-fill: #727272;
 }
 
@@ -142,25 +142,25 @@
   .common();
 }
 
-.bqplot {
+.bqplot_@{version} {
   box-sizing: border-box;
   display: flex;
   width: auto;
   height: 480px;
 }
 
-.bqplot > .svg-background {
+.bqplot_@{version} > .svg-background {
   position: absolute;
   width: 100%;
   height: 100%;
   z-index: 0;
 }
-.bqplot > canvas {
+.bqplot_@{version} > canvas {
   position: absolute;
   pointer-events: none;
   z-index: 0;
 }
-.bqplot > svg {
+.bqplot_@{version} > svg {
   z-index: 0;
   font: 11px sans-serif;
   user-select: none;
@@ -333,16 +333,16 @@
   }
 }
 
-.bqplot .toolbar_div {
+.bqplot_@{version} .toolbar_div {
   position: absolute;
   transition: visibility 0.5s linear, opacity 0.5s linear;
 }
 
-.bqplot_tooltip_div {
+.bqplot_@{version}_tooltip_div {
   z-index: 1001;
 }
 
-.bqplot_mark_tooltip {
+.bqplot_@{version}_mark_tooltip {
   pointer-events: none;
   z-index: 1001;
   color: var(--bq-content-font-color);
@@ -354,29 +354,29 @@
   -moz-user-select: var(--bq-mark-tooltip--moz-user-select);
 }
 
-.bqplot_mark_tooltip > .bqplot.figure {
+.bqplot_@{version}_mark_tooltip > .bqplot_@{version}.figure {
   width: 427px;
   height: 320px;
 }
 
-.bqplot_mark_tooltip .tooltiptext {
+.bqplot_@{version}_mark_tooltip .tooltiptext {
   text-align: center;
   padding: 0.5em;
 }
 
-.bqplot .world_map path {
+.bqplot_@{version} .world_map path {
   stroke: var(--bq-world-map-path-stroke);
   stroke-width: var(--bq-world-map-path-stroke-width);
   fill: var(--bq-world-map-path-fill);
 }
 
-.bqplot .world_map .hovered {
+.bqplot_@{version} .world_map .hovered {
   fill: Orange;
   stroke: Orange;
   stroke-width: 2.5px;
 }
 
-.bqplot .world_map #container {
+.bqplot_@{version} .world_map #container {
   margin: 10px 10%;
   border: 2px solid #000;
   border-radius: 5px;
@@ -385,52 +385,52 @@
   background: #f0f8ff;
 }
 
-.bqplot .world_map .graticule {
+.bqplot_@{version} .world_map .graticule {
   fill: none;
   stroke: #bbb;
   stroke-width: 0.5px;
   stroke-opacity: 0.5;
 }
 
-.bqplot .g_legend {
+.bqplot_@{version} .g_legend {
   fill: none;
 }
 
-.bqplot .pie polyline {
+.bqplot_@{version} .pie polyline {
   opacity: var(--bq-pie-polyline-opacity);
   stroke: var(--bq-pie-polyline-stroke);
   stroke-width: var(--bq-pie-polyline-stroke-width);
   fill: var(--bq-pie-polyline-fill);
 }
 
-.bqplot .pie_label {
+.bqplot_@{version} .pie_label {
   fill: var(--bq-content-font-color);
 }
 
-.bqplot .bar_label,
-.bqplot .curve_label {
+.bqplot_@{version} .bar_label,
+.bqplot_@{version} .curve_label {
   fill: var(--bq-content-font-color);
 }
 
-.bqplot .network .node .element {
+.bqplot_@{version} .network .node .element {
   fill: var(--bq-network-node-element-fill);
   stroke: var(--bq-network-node-element-stroke);
   stroke-width: var(--bq-network-node-element-stroke-width);
 }
 
-.bqplot .network .link {
+.bqplot_@{version} .network .link {
   fill: var(--bq-network-link-fill);
   stroke: var(--bq-network-link-stroke);
   stroke-width: var(--bq-network-link-stroke-width);
 }
 
-.bqplot .network .node .label {
+.bqplot_@{version} .network .node .label {
   font: var(--bq-network-node-label-font);
   pointer-events: var(--bq-network-node-label-pointer-events);
   text-shadow: var(--bq-network-node-label-text-shadow);
   fill: var(--bq-network-node-label-text-fill);
 }
 
-.bqplot .linkarrow {
+.bqplot_@{version} .linkarrow {
   fill: var(--bq-linkarrow-fill-dark);
 }
diff --git a/js/package.json b/js/package.json
index 336cd4be1..2dbbf26cd 100644
--- a/js/package.json
+++ b/js/package.json
@@ -21,7 +21,7 @@
   },
   "scripts": {
     "build": "jlpm run build:css && jlpm run build:js && jlpm run build:labextension && webpack --mode=production",
-    "build:css": "lessc less/bqplot.less css/bqplot.css",
+    "build:css": "python scripts/build_css.py",
     "build:js": "tsc --build src",
     "build:labextension": "jupyter labextension build .",
     "watch": "npm-run-all -p watch:*",
diff --git a/js/scripts/build_css.py b/js/scripts/build_css.py
new file mode 100644
index 000000000..dc59f9fa6
--- /dev/null
+++ b/js/scripts/build_css.py
@@ -0,0 +1,37 @@
+import re
+import json
+import subprocess
+from pathlib import Path
+
+# paths
+root = Path(__file__).parent.parent
+package_json = root / "package.json"
+less_input = root / "less" / "bqplot.less"
+tmp_less_input = root / "less" / "bqplot.tmp.less"
+css_output = root / "css" / "bqplot.css"
+
+# load version from package.json
+with package_json.open() as f:
+    pkg = json.load(f)
+
+version = pkg.get('version')
+clean_version = re.sub(r'[^0-9A-Za-z]+', '_', version)
+
+with open(less_input, 'r') as fobj:
+    less_code = fobj.read().replace('@{version}', clean_version)
+
+with open(tmp_less_input, 'w') as fobj:
+    fobj.write(less_code)
+
+cmd = [
+    "lessc",
+    str(tmp_less_input),
+    str(css_output),
+]
+
+print(f"Run command {' '.join(cmd)}")
+
+# run lessc with modify-var
+subprocess.run(cmd, check=True)
+
+print(f"Built CSS for bqplot version {version} {clean_version}")
diff --git a/js/src/Axis.ts b/js/src/Axis.ts
index e837d4343..5e0ee6fd8 100644
--- a/js/src/Axis.ts
+++ b/js/src/Axis.ts
@@ -285,7 +285,7 @@ export class Axis extends WidgetView {
     const tickLabels = this.model.get('tick_labels');
     if (tickLabels && Object.keys(tickLabels).length > 0) {
       const formatter = (data) => {
-        let value = tickLabels[data];
+        const value = tickLabels[data];
         if (value === undefined) {
           return default_formatter(data);
         } else {
@@ -855,7 +855,7 @@ export class Axis extends WidgetView {
     if (!(isLinearScale(this.axis_scale) || isColorScale(this.axis_scale))) {
       return -1;
     }
-    let ticks: any[] = this.axis.tickValues();
+    const ticks: any[] = this.axis.tickValues();
     // Case where all data is concentrated into one point.
     if (ticks.length === 1) {
       return 1;
@@ -895,7 +895,7 @@ export class Axis extends WidgetView {
     if (!isDateScale(this.axis_scale)) {
       return;
     }
-    let ticks: any[] = this.axis.tickValues();
+    const ticks: any[] = this.axis.tickValues();
     // diff is the difference between ticks in milliseconds
     const diff = Math.abs(ticks[1] - ticks[0]);
 
@@ -974,7 +974,7 @@ export class Axis extends WidgetView {
     if (!isLogScale(this.axis_scale)) {
       return -1;
     }
-    let ticks: any[] = this.axis.tickValues();
+    const ticks: any[] = this.axis.tickValues();
     const ratio = Math.abs(Math.log10(ticks[1] / ticks[0]));
 
     if (ratio >= 0.301) {
@@ -1055,7 +1055,7 @@ export class Axis extends WidgetView {
     this.autoOffset = autoOffset;
   }
 
-  autoOffset: number = 0;
+  autoOffset = 0;
   axis_scale: Scale;
   axis: d3.Axis<d3.AxisDomain>;
   d3el: d3.Selection<HTMLElement, any, any, any>;
diff --git a/js/src/BarsModel.ts b/js/src/BarsModel.ts
index b5fdf27e8..c545ceb01 100644
--- a/js/src/BarsModel.ts
+++ b/js/src/BarsModel.ts
@@ -155,7 +155,7 @@ export class BarsModel extends MarkModel {
           };
         });
 
-        let extremes = [this.baseValue, cumulativeNeg, cumulativePos];
+        const extremes = [this.baseValue, cumulativeNeg, cumulativePos];
         // posMax is the maximum positive value for a group of
         // bars.
         data.posMax = d3.max(extremes);
diff --git a/js/src/Figure.ts b/js/src/Figure.ts
index ff80ea0e3..abe18db7c 100644
--- a/js/src/Figure.ts
+++ b/js/src/Figure.ts
@@ -36,6 +36,12 @@ import { MarkModel } from './MarkModel';
 import { Interaction } from './Interaction';
 import { FigureModel } from './FigureModel';
 import { Axis } from './Axis';
+import { version } from './version';
+
+export const FIGURE_CSS_CLASS = `bqplot_${version.replace(
+  /[^0-9A-Za-z]+/g,
+  '_'
+)}`;
 
 interface IFigureSize {
   width: number;
@@ -53,7 +59,7 @@ export class Figure extends DOMWidgetView {
       this.updateDecorators();
     }, 100);
     // Internet Explorer does not support classList for svg elements
-    this.el.classList.add('bqplot');
+    this.el.classList.add(FIGURE_CSS_CLASS);
     this.el.classList.add('figure');
     this.el.classList.add('jupyter-widgets');
     this.change_theme();
@@ -121,12 +127,12 @@ export class Figure extends DOMWidgetView {
       return domSize;
     }
 
-    let solver = new kiwi.Solver();
-    var width = new kiwi.Variable();
-    var height = new kiwi.Variable();
+    const solver = new kiwi.Solver();
+    const width = new kiwi.Variable();
+    const height = new kiwi.Variable();
 
     // calculate padding by summing up all auto sizes + fig_margins
-    var padding = { top: 0, bottom: 0, left: 0, right: 0 };
+    const padding = { top: 0, bottom: 0, left: 0, right: 0 };
     const fig_margin = this.model.get('fig_margin');
     ['top', 'bottom', 'left', 'right'].forEach((side) => {
       padding[side] = this.decorators[side].reduce((total, decorator) => {
@@ -174,8 +180,8 @@ export class Figure extends DOMWidgetView {
       y - padding.top - domSize.height/2 + height/2 + padding.bottom/2 + padding.top/2 = 0
       y - padding.top/2 - domSize.height/2 + height/2 + padding.bottom/2 = 0
     */
-    var x = new kiwi.Variable();
-    var y = new kiwi.Variable();
+    const x = new kiwi.Variable();
+    const y = new kiwi.Variable();
     solver.addConstraint(
       new kiwi.Constraint(
         new kiwi.Expression(
@@ -281,7 +287,7 @@ export class Figure extends DOMWidgetView {
 
     this.tooltip_div = d3
       .select(document.createElement('div'))
-      .attr('class', 'bqplot_tooltip_div');
+      .attr('class', `${FIGURE_CSS_CLASS}_tooltip_div`);
     this.popper_reference = new popperreference.PositionReference({
       x: 0,
       y: 0,
@@ -1364,7 +1370,7 @@ export class Figure extends DOMWidgetView {
       const image = new Image();
       image.onload = () => {
         const canvas = document.createElement('canvas');
-        canvas.classList.add('bqplot');
+        canvas.classList.add(FIGURE_CSS_CLASS);
         canvas.width = this.width * scale;
         canvas.height = this.height * scale;
         canvas.style.width = this.width.toString();
@@ -1565,12 +1571,12 @@ export class Figure extends DOMWidgetView {
   fig_marks: d3.Selection<SVGGraphicsElement, any, any, any>;
   fig_background: d3.Selection<SVGGraphicsElement, any, any, any>;
   fig: d3.Selection<SVGGraphicsElement, any, any, any>;
-  figure_padding_x: number = 0;
-  figure_padding_y: number = 0;
-  width: number = 0;
-  height: number = 0;
-  offsetX: number = 0;
-  offsetY: number = 0;
+  figure_padding_x = 0;
+  figure_padding_y = 0;
+  width = 0;
+  height = 0;
+  offsetX = 0;
+  offsetY = 0;
   interaction_view: Interaction;
   interaction: d3.Selection<SVGGElement, any, any, any>;
   mark_views: ViewList<Mark>;
diff --git a/js/src/Mark.ts b/js/src/Mark.ts
index 9efc27937..32ea33335 100644
--- a/js/src/Mark.ts
+++ b/js/src/Mark.ts
@@ -25,7 +25,7 @@ import { Widget } from '@lumino/widgets';
 import { d3GetEvent, getLuminoWidget } from './utils';
 import * as _ from 'underscore';
 import { MarkModel } from './MarkModel';
-import { Figure } from './Figure';
+import { FIGURE_CSS_CLASS, Figure } from './Figure';
 import { applyStyles } from './utils';
 
 // Check that value is defined and not null
@@ -76,7 +76,7 @@ export abstract class Mark extends widgets.WidgetView {
     }
     this.tooltip_div = d3
       .select(document.createElement('div'))
-      .attr('class', 'bqplot_mark_tooltip')
+      .attr('class', `${FIGURE_CSS_CLASS}_mark_tooltip`)
       .attr('id', 'tooltip_' + this.uuid)
       .style('display', 'none')
       .style('opacity', 0);
diff --git a/js/src/MarketMap.ts b/js/src/MarketMap.ts
index d54f19905..9983fe57a 100644
--- a/js/src/MarketMap.ts
+++ b/js/src/MarketMap.ts
@@ -30,7 +30,7 @@ import { Scale } from 'bqscales';
 
 import * as d3 from 'd3';
 // var d3 =Object.assign({}, require("d3-array"), require("d3-format"), require("d3-selection"), require("d3-selection-multi"), require("d3-shape"));
-import { Figure } from './Figure';
+import { Figure, FIGURE_CSS_CLASS } from './Figure';
 import { MarketMapModel } from './MarketMapModel';
 import { Tooltip } from './Tooltip';
 import * as popperreference from './PopperReference';
@@ -84,7 +84,7 @@ export class MarketMap extends Figure {
     // code for tool tip to be displayed
     this.tooltip_div = d3
       .select(document.createElement('div'))
-      .attr('class', 'bqplot_mark_tooltip');
+      .attr('class', `${FIGURE_CSS_CLASS}_mark_tooltip`);
     applyStyles(this.tooltip_div, { opacity: 0, 'pointer-events': 'none' });
 
     const freeze_tooltip_loc = this.model.get('freeze_tooltip_location');
diff --git a/js/src/index-embed.ts b/js/src/index-embed.ts
index 03ec6ee77..af130f0c2 100644
--- a/js/src/index-embed.ts
+++ b/js/src/index-embed.ts
@@ -13,5 +13,5 @@
  * limitations under the License.
  */
 
-require('../less/bqplot.less');
+require('../less/bqplot.tmp.less');
 module.exports = require('./index');
diff --git a/js/src/version.ts b/js/src/version.ts
index 50ef7f311..03b3eab89 100644
--- a/js/src/version.ts
+++ b/js/src/version.ts
@@ -15,4 +15,5 @@
 
 import packageJson from '../package.json';
 
+export const version = packageJson.version;
 export const semver_range = '^' + packageJson.version;