diff --git a/packages/core/src/browser/style/index.css b/packages/core/src/browser/style/index.css
index ce0551792645c..e6de16c4261fd 100644
--- a/packages/core/src/browser/style/index.css
+++ b/packages/core/src/browser/style/index.css
@@ -175,6 +175,16 @@ textarea {
   font-family: var(--theia-ui-font-family);
 }
 
+.theia-transparent-overlay {
+    background-color: transparent;
+    position: absolute;
+    top: 0;
+    left: 0;
+    height: 100%;
+    width: 100%;
+    z-index: 999;
+}
+
 /*-----------------------------------------------------------------------------
 | Import children style files
 |----------------------------------------------------------------------------*/
diff --git a/packages/mini-browser/src/browser/mini-browser-content-style.ts b/packages/mini-browser/src/browser/mini-browser-content-style.ts
index 6947cfba5356f..03af1de7a3803 100644
--- a/packages/mini-browser/src/browser/mini-browser-content-style.ts
+++ b/packages/mini-browser/src/browser/mini-browser-content-style.ts
@@ -27,6 +27,6 @@ export namespace MiniBrowserContentStyle {
     export const OPEN = 'theia-mini-browser-open';
     export const BUTTON = 'theia-mini-browser-button';
     export const DISABLED = 'theia-mini-browser-button-disabled';
-    export const TRANSPARENT_OVERLAY = 'theia-mini-browser-transparent-overlay';
+    export const TRANSPARENT_OVERLAY = 'theia-transparent-overlay';
     export const ERROR_BAR = 'theia-mini-browser-error-bar';
 }
diff --git a/packages/mini-browser/src/browser/style/index.css b/packages/mini-browser/src/browser/style/index.css
index 8718a9d02ba61..1b82d4e613f49 100644
--- a/packages/mini-browser/src/browser/style/index.css
+++ b/packages/mini-browser/src/browser/style/index.css
@@ -158,13 +158,3 @@
     flex-grow: 1;
     border: none; margin: 0; padding: 0;
 }
-
-.theia-mini-browser-transparent-overlay {
-    background-color: transparent;
-    position: absolute;
-    top: 0;
-    left: 0;
-    height: 100%;
-    width: 100%;
-    z-index: 999;
-}
diff --git a/packages/plugin-ext/package.json b/packages/plugin-ext/package.json
index 1f42bceaf3039..eb9b8f42cd814 100644
--- a/packages/plugin-ext/package.json
+++ b/packages/plugin-ext/package.json
@@ -13,7 +13,6 @@
     "@theia/languages": "^0.12.0",
     "@theia/markers": "^0.12.0",
     "@theia/messages": "^0.12.0",
-    "@theia/mini-browser": "^0.12.0",
     "@theia/monaco": "^0.12.0",
     "@theia/navigator": "^0.12.0",
     "@theia/output": "^0.12.0",
diff --git a/packages/plugin-ext/src/main/browser/webview/webview.ts b/packages/plugin-ext/src/main/browser/webview/webview.ts
index 61c1852cd908a..d0bb30e16c264 100644
--- a/packages/plugin-ext/src/main/browser/webview/webview.ts
+++ b/packages/plugin-ext/src/main/browser/webview/webview.ts
@@ -26,8 +26,6 @@ import { injectable, inject, postConstruct } from 'inversify';
 import { WebviewPanelOptions, WebviewPortMapping } from '@theia/plugin';
 import { BaseWidget, Message } from '@theia/core/lib/browser/widgets/widget';
 import { Disposable, DisposableCollection } from '@theia/core/lib/common/disposable';
-// TODO: get rid of dependencies to the mini browser
-import { MiniBrowserContentStyle } from '@theia/mini-browser/lib/browser/mini-browser-content-style';
 import { ApplicationShellMouseTracker } from '@theia/core/lib/browser/shell/application-shell-mouse-tracker';
 import { StatefulWidget } from '@theia/core/lib/browser/shell/shell-layout-restorer';
 import { WebviewPanelViewState } from '../../../common/plugin-api-rpc';
@@ -49,6 +47,9 @@ import { WebviewResourceLoader } from '../../common/webview-protocol';
 import { WebviewResourceCache } from './webview-resource-cache';
 import { Endpoint } from '@theia/core/lib/browser/endpoint';
 
+// Style from core
+const TRANSPARENT_OVERLAY_STYLE = 'theia-transparent-overlay';
+
 // tslint:disable:no-any
 
 export const enum WebviewMessageChannels {
@@ -176,7 +177,7 @@ export class WebviewWidget extends BaseWidget implements StatefulWidget {
         this.toDispose.push(this.onMessageEmitter);
 
         this.transparentOverlay = document.createElement('div');
-        this.transparentOverlay.classList.add(MiniBrowserContentStyle.TRANSPARENT_OVERLAY);
+        this.transparentOverlay.classList.add(TRANSPARENT_OVERLAY_STYLE);
         this.transparentOverlay.style.display = 'none';
         this.node.appendChild(this.transparentOverlay);