diff --git a/standalone_app/src/PlotlyDarkMode.ts b/standalone_app/src/PlotlyDarkMode.ts
deleted file mode 100644
index 8dd3e041..00000000
--- a/standalone_app/src/PlotlyDarkMode.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-import * as plotly from "plotly.js-dist-min"
-
-// Following template is extracted from the sdist of plotly Python library.
-// See https://github.com/plotly/plotly.py/blob/v5.6.0/packages/python/plotly/templategen/__init__.py and
-// https://github.com/plotly/plotly.py/blob/v5.6.0/packages/python/plotly/templategen/definitions.py
-
-//@ts-ignore
-export const plotlyDarkTemplate: Partial<plotly.Template> = {"data":{"bar":[{"error_x":{"color":"#f2f5fa"},"error_y":{"color":"#f2f5fa"},"marker":{"line":{"color":"rgb(17,17,17)","width":0.5},"pattern":{"fillmode":"overlay","size":10,"solidity":0.2}},"type":"bar"}],"barpolar":[{"marker":{"line":{"color":"rgb(17,17,17)","width":0.5},"pattern":{"fillmode":"overlay","size":10,"solidity":0.2}},"type":"barpolar"}],"carpet":[{"aaxis":{"endlinecolor":"#A2B1C6","gridcolor":"#506784","linecolor":"#506784","minorgridcolor":"#506784","startlinecolor":"#A2B1C6"},"baxis":{"endlinecolor":"#A2B1C6","gridcolor":"#506784","linecolor":"#506784","minorgridcolor":"#506784","startlinecolor":"#A2B1C6"},"type":"carpet"}],"choropleth":[{"colorbar":{"outlinewidth":0,"ticks":""},"type":"choropleth"}],"contour":[{"colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"type":"contour"}],"contourcarpet":[{"colorbar":{"outlinewidth":0,"ticks":""},"type":"contourcarpet"}],"heatmap":[{"colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"type":"heatmap"}],"heatmapgl":[{"colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"type":"heatmapgl"}],"histogram":[{"marker":{"pattern":{"fillmode":"overlay","size":10,"solidity":0.2}},"type":"histogram"}],"histogram2d":[{"colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"type":"histogram2d"}],"histogram2dcontour":[{"colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"type":"histogram2dcontour"}],"mesh3d":[{"colorbar":{"outlinewidth":0,"ticks":""},"type":"mesh3d"}],"parcoords":[{"line":{"colorbar":{"outlinewidth":0,"ticks":""}},"type":"parcoords"}],"pie":[{"automargin":true,"type":"pie"}],"scatter":[{"marker":{"line":{"color":"#283442"}},"type":"scatter"}],"scatter3d":[{"line":{"colorbar":{"outlinewidth":0,"ticks":""}},"marker":{"colorbar":{"outlinewidth":0,"ticks":""}},"type":"scatter3d"}],"scattercarpet":[{"marker":{"colorbar":{"outlinewidth":0,"ticks":""}},"type":"scattercarpet"}],"scattergeo":[{"marker":{"colorbar":{"outlinewidth":0,"ticks":""}},"type":"scattergeo"}],"scattergl":[{"marker":{"line":{"color":"#283442"}},"type":"scattergl"}],"scattermapbox":[{"marker":{"colorbar":{"outlinewidth":0,"ticks":""}},"type":"scattermapbox"}],"scatterpolar":[{"marker":{"colorbar":{"outlinewidth":0,"ticks":""}},"type":"scatterpolar"}],"scatterpolargl":[{"marker":{"colorbar":{"outlinewidth":0,"ticks":""}},"type":"scatterpolargl"}],"scatterternary":[{"marker":{"colorbar":{"outlinewidth":0,"ticks":""}},"type":"scatterternary"}],"surface":[{"colorbar":{"outlinewidth":0,"ticks":""},"colorscale":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"type":"surface"}],"table":[{"cells":{"fill":{"color":"#506784"},"line":{"color":"rgb(17,17,17)"}},"header":{"fill":{"color":"#2a3f5f"},"line":{"color":"rgb(17,17,17)"}},"type":"table"}]},"layout":{"annotationdefaults":{"arrowcolor":"#f2f5fa","arrowhead":0,"arrowwidth":1},"autotypenumbers":"strict","coloraxis":{"colorbar":{"outlinewidth":0,"ticks":""}},"colorscale":{"diverging":[[0,"#8e0152"],[0.1,"#c51b7d"],[0.2,"#de77ae"],[0.3,"#f1b6da"],[0.4,"#fde0ef"],[0.5,"#f7f7f7"],[0.6,"#e6f5d0"],[0.7,"#b8e186"],[0.8,"#7fbc41"],[0.9,"#4d9221"],[1,"#276419"]],"sequential":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]],"sequentialminus":[[0.0,"#0d0887"],[0.1111111111111111,"#46039f"],[0.2222222222222222,"#7201a8"],[0.3333333333333333,"#9c179e"],[0.4444444444444444,"#bd3786"],[0.5555555555555556,"#d8576b"],[0.6666666666666666,"#ed7953"],[0.7777777777777778,"#fb9f3a"],[0.8888888888888888,"#fdca26"],[1.0,"#f0f921"]]},"colorway":["#636efa","#EF553B","#00cc96","#ab63fa","#FFA15A","#19d3f3","#FF6692","#B6E880","#FF97FF","#FECB52"],"font":{"color":"#f2f5fa"},"geo":{"bgcolor":"rgb(17,17,17)","lakecolor":"rgb(17,17,17)","landcolor":"rgb(17,17,17)","showlakes":true,"showland":true,"subunitcolor":"#506784"},"hoverlabel":{"align":"left"},"hovermode":"closest","mapbox":{"style":"dark"},"paper_bgcolor":"rgb(17,17,17)","plot_bgcolor":"rgb(17,17,17)","polar":{"angularaxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""},"bgcolor":"rgb(17,17,17)","radialaxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""}},"scene":{"xaxis":{"backgroundcolor":"rgb(17,17,17)","gridcolor":"#506784","gridwidth":2,"linecolor":"#506784","showbackground":true,"ticks":"","zerolinecolor":"#C8D4E3"},"yaxis":{"backgroundcolor":"rgb(17,17,17)","gridcolor":"#506784","gridwidth":2,"linecolor":"#506784","showbackground":true,"ticks":"","zerolinecolor":"#C8D4E3"},"zaxis":{"backgroundcolor":"rgb(17,17,17)","gridcolor":"#506784","gridwidth":2,"linecolor":"#506784","showbackground":true,"ticks":"","zerolinecolor":"#C8D4E3"}},"shapedefaults":{"line":{"color":"#f2f5fa"}},"sliderdefaults":{"bgcolor":"#C8D4E3","bordercolor":"rgb(17,17,17)","borderwidth":1,"tickwidth":0},"ternary":{"aaxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""},"baxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""},"bgcolor":"rgb(17,17,17)","caxis":{"gridcolor":"#506784","linecolor":"#506784","ticks":""}},"title":{"x":0.05},"updatemenudefaults":{"bgcolor":"#506784","borderwidth":0},"xaxis":{"automargin":true,"gridcolor":"#283442","linecolor":"#506784","ticks":"","title":{"standoff":15},"zerolinecolor":"#283442","zerolinewidth":2},"yaxis":{"automargin":true,"gridcolor":"#283442","linecolor":"#506784","ticks":"","title":{"standoff":15},"zerolinecolor":"#283442","zerolinewidth":2}}}
diff --git a/standalone_app/src/components/PlotImportance.tsx b/standalone_app/src/components/PlotImportance.tsx
index 680e66d1..3ade1b61 100644
--- a/standalone_app/src/components/PlotImportance.tsx
+++ b/standalone_app/src/components/PlotImportance.tsx
@@ -1,9 +1,9 @@
 import { Box, Typography, useTheme } from "@mui/material"
+import { plotlyDarkTemplate } from "@optuna/storybook"
 import init, { wasm_fanova_calculate } from "optuna"
 import * as plotly from "plotly.js-dist-min"
 import React, { FC, useEffect, useState } from "react"
 
-import { plotlyDarkTemplate } from "../PlotlyDarkMode"
 const plotDomId = "graph-hyperparameter-importances"
 
 export const PlotImportance: FC<{ study: Study }> = ({ study }) => {
diff --git a/standalone_app/src/components/PlotIntermediateValues.tsx b/standalone_app/src/components/PlotIntermediateValues.tsx
index f0a740f1..b9654625 100644
--- a/standalone_app/src/components/PlotIntermediateValues.tsx
+++ b/standalone_app/src/components/PlotIntermediateValues.tsx
@@ -1,7 +1,7 @@
 import { Box, Typography, useTheme } from "@mui/material"
+import { plotlyDarkTemplate } from "@optuna/storybook"
 import * as plotly from "plotly.js-dist-min"
 import React, { FC, useEffect } from "react"
-import { plotlyDarkTemplate } from "../PlotlyDarkMode"
 
 const plotDomId = "graph-intermediate-values"
 
diff --git a/tslib/storybook/src/index.ts b/tslib/storybook/src/index.ts
index 7084ea00..48e4ecb2 100644
--- a/tslib/storybook/src/index.ts
+++ b/tslib/storybook/src/index.ts
@@ -2,3 +2,4 @@ export { DataGrid } from "./components/DataGrid";
 export type { DataGridColumn } from "./components/DataGrid";
 export { PlotHistory } from "./components/PlotHistory";
 export { TrialTable } from "./components/TrialTable";
+export { plotlyDarkTemplate } from "./components/PlotlyDarkMode";