diff --git a/CHANGELOG.md b/CHANGELOG.md
index f74d1a2..616b9ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Change Log
 
+### 2.2.0 (September 19, 2021)
+
+- add className for image slider
+  - `.rsis-container`
+  - `.rsis-image`
+
 ### 2.1.2 (June 16, 2021)
 
 - add 'startIndex' props.
diff --git a/README.md b/README.md
index 30f3bac..74d07f9 100644
--- a/README.md
+++ b/README.md
@@ -93,6 +93,25 @@ If You want to see more detail,<br>
 
 - [`example/app.tsx`](https://github.com/kimcoder/react-simple-image-slider/blob/master/example/App.tsx)<br>
 
+# Style customize
+
+- can customize by className with `!important`;
+
+```
+.your-app {
+  .rsis-container {
+    // do something
+  }
+}
+
+.your-app {
+  .rsis-image {
+    background-size: contain !important;
+  }
+}
+
+```
+
 # Development
 
 ### directory & source
diff --git a/example/App.tsx b/example/App.tsx
index b80fd7a..937fd3f 100644
--- a/example/App.tsx
+++ b/example/App.tsx
@@ -13,6 +13,7 @@ import MenuItem from '@material-ui/core/MenuItem';
 import Select from '@material-ui/core/Select';
 import SimpleImageSlider from '../dist';
 import Input from '@material-ui/core/Input';
+import './app.scss';
 
 const IMAGES = [
   { url: 'images/1.jpg' },
@@ -100,7 +101,7 @@ const App: React.FC = () => {
   );
 
   return (
-    <div style={{ textAlign: 'center' }}>
+    <div style={{ textAlign: 'center' }} className="root">
       <CssBaseline />
       <AppBar style={{ position: 'relative', height: 140, textAlign: 'center' }}>
         <h1 style={{ marginBottom: 5 }}>React Simple Image Slider Example</h1>
diff --git a/example/app.scss b/example/app.scss
new file mode 100644
index 0000000..0c75f21
--- /dev/null
+++ b/example/app.scss
@@ -0,0 +1,5 @@
+.root {
+  .rsis-image {
+    background-size: cover !important;
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index e8513f8..f872d48 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "react-simple-image-slider",
-  "version": "2.0.4",
+  "version": "2.1.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
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+    },
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@@ -2784,6 +2779,33 @@
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       }
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+      "dev": true,
+      "requires": {
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+        "postcss": "^8.2.15",
+        "postcss-modules-extract-imports": "^3.0.0",
+        "postcss-modules-local-by-default": "^4.0.0",
+        "postcss-modules-scope": "^3.0.0",
+        "postcss-modules-values": "^4.0.0",
+        "postcss-value-parser": "^4.1.0",
+        "semver": "^7.3.5"
+      },
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+          "dev": true,
+          "requires": {
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+          }
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+    },
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@@ -2794,6 +2816,12 @@
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+    },
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@@ -4526,6 +4531,12 @@
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+      "version": "0.6.2",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-0.6.2.tgz",
+      "integrity": "sha512-/3GptzWzu0+0MBQFrDKzw/DvvMTUORvgY6k6jd/VS6iCR4RDTKWH6v6WPwQoUO8667uQEf9Oe38DxAYWY5F/Ug==",
+      "dev": true
+    },
     "source-map-resolve": {
       "version": "0.5.3",
       "resolved": "https://registry.npmjs.org/source-map-resolve/-/source-map-resolve-0.5.3.tgz",
@@ -6966,15 +7113,6 @@
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
       "dev": true
     },
-    "ssri": {
-      "version": "6.0.2",
-      "resolved": "https://registry.npmjs.org/ssri/-/ssri-6.0.2.tgz",
-      "integrity": "sha512-cepbSq/neFK7xB6A50KHN0xHDotYzq58wWCa5LeWqnPrHG8GzfEjO/4O8kpmcGW+oaxkvhEJCWgbgNk4/ZV93Q==",
-      "dev": true,
-      "requires": {
-        "figgy-pudding": "^3.5.1"
-      }
-    },
     "static-extend": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/static-extend/-/static-extend-0.1.2.tgz",
@@ -7094,6 +7232,12 @@
         "escape-string-regexp": "^1.0.2"
       }
     },
+    "style-loader": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/style-loader/-/style-loader-3.2.1.tgz",
+      "integrity": "sha512-1k9ZosJCRFaRbY6hH49JFlRB0fVSbmnyq1iTPjNxUmGVjBNEmwrrHPenhlp+Lgo51BojHSf6pl2FcqYaN3PfVg==",
+      "dev": true
+    },
     "supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
diff --git a/package.json b/package.json
index e41f171..823d1c3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-simple-image-slider",
-  "version": "2.1.2",
+  "version": "2.2.0",
   "description": "simple image slider component for react",
   "main": "dist/index.js",
   "scripts": {
@@ -54,6 +54,7 @@
     "@typescript-eslint/parser": "^4.27.0",
     "babel-loader": "^8.2.2",
     "core-js": "^3.8.3",
+    "css-loader": "^6.3.0",
     "eslint": "^7.19.0",
     "eslint-plugin-prettier": "^3.3.1",
     "eslint-plugin-react": "^7.22.0",
@@ -62,6 +63,9 @@
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
     "rollup": "^2.26.5",
+    "sass": "^1.41.1",
+    "sass-loader": "^12.1.0",
+    "style-loader": "^3.2.1",
     "typescript": "^4.3.2",
     "webpack": "^5.39.0",
     "webpack-cli": "^4.7.2",
diff --git a/src/ImageSlider.tsx b/src/ImageSlider.tsx
index 7e80e96..87efc5a 100644
--- a/src/ImageSlider.tsx
+++ b/src/ImageSlider.tsx
@@ -124,8 +124,8 @@ const SimpleImageSlider: React.FC<SimpleImageSliderProps> = ({
     <div style={{ ...rootStyle, ...style }}>
       <div style={styles.getSubContainer(width, height)}>
         {/* Render Slider */}
-        <div style={styles.ImageSlider} onClick={handleClick}>
-          <div style={currentSliderStyle} onTransitionEnd={handleSlideEnd} />
+        <div style={styles.ImageSlider} onClick={handleClick} className="rsis-container">
+          <div style={currentSliderStyle} onTransitionEnd={handleSlideEnd} className="rsis-image" />
           {images.length > 1 && <div style={nextSliderStyle} />}
         </div>
 
diff --git a/webpack.config.js b/webpack.config.js
index 94a8bfe..6ef808f 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -14,6 +14,10 @@ module.exports = {
         test: /\.tsx$/,
         exclude: /node_modules/,
         use: 'babel-loader'
+      },
+      {
+        test: /\.s[ac]ss$/i,
+        use: ['style-loader', 'css-loader', 'sass-loader']
       }
     ]
   },