diff --git a/ElectronNET.API/WebContents.cs b/ElectronNET.API/WebContents.cs
index 6de9117..66800d5 100644
--- a/ElectronNET.API/WebContents.cs
+++ b/ElectronNET.API/WebContents.cs
@@ -258,6 +258,18 @@ namespace ElectronNET.API
             return taskCompletionSource.Task;
         }
 
+        /// <summary>
+        /// Inserts CSS into the web page.
+        /// See: https://www.electronjs.org/docs/api/web-contents#contentsinsertcsscss-options
+        /// Works for both BrowserWindows and BrowserViews.
+        /// </summary>
+        /// <param name="isBrowserWindow">Whether the webContents belong to a BrowserWindow or not (the other option is a BrowserView)</param>
+        /// <param name="path">Absolute path to the CSS file location</param>
+        public void InsertCSS(bool isBrowserWindow, string path)
+        {
+            BridgeConnector.Socket.Emit("webContents-insertCSS", Id, isBrowserWindow, path);
+        }
+
         private JsonSerializer _jsonSerializer = new JsonSerializer()
         {
             ContractResolver = new CamelCasePropertyNamesContractResolver(),
diff --git a/ElectronNET.Host/api/webContents.js b/ElectronNET.Host/api/webContents.js
index e5ccebc..99622e2 100644
--- a/ElectronNET.Host/api/webContents.js
+++ b/ElectronNET.Host/api/webContents.js
@@ -173,6 +173,27 @@ module.exports = (socket) => {
             electronSocket.emit('webContents-loadURL-error' + id, error);
         });
     });
+    socket.on('webContents-insertCSS', (id, isBrowserWindow, path) => {
+        if (isBrowserWindow) {
+            const browserWindow = getWindowById(id);
+            if (browserWindow) {
+                browserWindow.webContents.insertCSS(fs.readFileSync(path, 'utf8'));
+            }
+        }
+        else {
+            const browserViews = (global['browserViews'] = global['browserViews'] || []);
+            let view = null;
+            for (let i = 0; i < browserViews.length; i++) {
+                if (browserViews[i]['id'] + 1000 === id) {
+                    view = browserViews[i];
+                    break;
+                }
+            }
+            if (view) {
+                view.webContents.insertCSS(fs.readFileSync(path, 'utf8'));
+            }
+        }
+    });
     function getWindowById(id) {
         if (id >= 1000) {
             return browserView_1.browserViewMediateService(id - 1000);
diff --git a/ElectronNET.Host/api/webContents.js.map b/ElectronNET.Host/api/webContents.js.map
index a441120..fb7f0b0 100644
--- a/ElectronNET.Host/api/webContents.js.map
+++ b/ElectronNET.Host/api/webContents.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/ElectronNET.Host/api/webContents.ts b/ElectronNET.Host/api/webContents.ts
index 4182aa2..67a4b3e 100644
--- a/ElectronNET.Host/api/webContents.ts
+++ b/ElectronNET.Host/api/webContents.ts
@@ -1,4 +1,4 @@
-import { BrowserWindow } from 'electron';
+import { BrowserWindow, BrowserView } from 'electron';
 import { browserViewMediateService } from './browserView';
 const fs = require('fs');
 let electronSocket;
@@ -222,6 +222,27 @@ export = (socket: SocketIO.Socket) => {
         });
     });
 
+    socket.on('webContents-insertCSS', (id, isBrowserWindow, path) => {
+        if (isBrowserWindow) {
+            const browserWindow = getWindowById(id);
+            if (browserWindow) {
+                browserWindow.webContents.insertCSS(fs.readFileSync(path, 'utf8'));
+            }
+        } else {
+            const browserViews: BrowserView[] = (global['browserViews'] = global['browserViews'] || []) as BrowserView[];
+            let view: BrowserView = null;
+            for (let i = 0; i < browserViews.length; i++) {
+                if (browserViews[i]['id'] + 1000 === id) {
+                    view = browserViews[i];
+                    break;
+                }
+            }
+            if (view) {
+                view.webContents.insertCSS(fs.readFileSync(path, 'utf8'));
+            }
+        }
+    });
+
     function getWindowById(id: number): Electron.BrowserWindow | Electron.BrowserView {
 
         if (id >= 1000) {