diff --git a/src/core/public/_variables.scss b/src/core/public/_variables.scss
index f77e2b4d2755..9d8077b50ad4 100644
--- a/src/core/public/_variables.scss
+++ b/src/core/public/_variables.scss
@@ -1,10 +1,3 @@
 @import "@elastic/eui/src/global_styling/variables/header";
 
 $osdHeaderOffset: $euiHeaderHeightCompensation;
-$osdHeaderBreadcrumbBlueBackground: #b9d9eb;
-$osdHeaderBreadcrumbGrayBackground: #d9e1e2;
-$osdHeaderBreadcrumbCollapsedLink: #002a3a;
-$osdHeaderBreadcrumbPacificSkyDarkestBackground: #163f66;
-$osdHeaderBreadcrumbMidnightSkyMediumBackground: #4c636f;
-$osdHeaderBreadcrumbMidnightSkyMediumLightColor: #96a0a5;
-$osdHeaderBreadcrumbMidnightSkyMediumLightHoverColor: #b0b8bb;
diff --git a/src/core/public/chrome/public/assets/round_filter.svg b/src/core/public/chrome/public/assets/round_filter.svg
deleted file mode 100644
index 84cf36058553..000000000000
--- a/src/core/public/chrome/public/assets/round_filter.svg
+++ /dev/null
@@ -1,8 +0,0 @@
-<svg style="visibility: hidden; position: absolute;" width="0" height="0" xmlns="http://www.w3.org/2000/svg" version="1.1">
-  <defs>
-        <filter id="round"><feGaussianBlur in="SourceGraphic" stdDeviation="2"/>    
-            <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 19 -9" result="goo" />
-            <feComposite in="SourceGraphic" in2="goo" operator="atop"/>
-        </filter>
-    </defs>
-</svg>
\ No newline at end of file
diff --git a/src/core/public/chrome/ui/header/header.tsx b/src/core/public/chrome/ui/header/header.tsx
index a78371f4f264..f8eb7c9e7052 100644
--- a/src/core/public/chrome/ui/header/header.tsx
+++ b/src/core/public/chrome/ui/header/header.tsx
@@ -114,7 +114,7 @@ export function Header({
   const toggleCollapsibleNavRef = createRef<HTMLButtonElement & { euiAnimate: () => void }>();
   const navId = htmlIdGenerator()();
   const className = classnames('hide-for-sharing', 'headerGlobalNav');
-  const { useExpandedHeader = true, darkMode } = branding;
+  const { useExpandedHeader = true } = branding;
 
   return (
     <>
@@ -202,7 +202,6 @@ export function Header({
             <HeaderBreadcrumbs
               appTitle$={observables.appTitle$}
               breadcrumbs$={observables.breadcrumbs$}
-              isDarkMode={darkMode}
             />
 
             <EuiHeaderSectionItem border="none">
diff --git a/src/core/public/chrome/ui/header/header_breadcrumbs.test.tsx b/src/core/public/chrome/ui/header/header_breadcrumbs.test.tsx
index d95e7881cf5a..2008a3f6c493 100644
--- a/src/core/public/chrome/ui/header/header_breadcrumbs.test.tsx
+++ b/src/core/public/chrome/ui/header/header_breadcrumbs.test.tsx
@@ -38,11 +38,7 @@ describe('HeaderBreadcrumbs', () => {
   it('renders updates to the breadcrumbs$ observable', () => {
     const breadcrumbs$ = new BehaviorSubject([{ text: 'First' }]);
     const wrapper = mount(
-      <HeaderBreadcrumbs
-        appTitle$={new BehaviorSubject('')}
-        breadcrumbs$={breadcrumbs$}
-        isDarkMode={false}
-      />
+      <HeaderBreadcrumbs appTitle$={new BehaviorSubject('')} breadcrumbs$={breadcrumbs$} />
     );
     expect(wrapper.find('.euiBreadcrumb')).toMatchSnapshot();
 
diff --git a/src/core/public/chrome/ui/header/header_breadcrumbs.tsx b/src/core/public/chrome/ui/header/header_breadcrumbs.tsx
index aa97e3c846d1..ca50b15d5af6 100644
--- a/src/core/public/chrome/ui/header/header_breadcrumbs.tsx
+++ b/src/core/public/chrome/ui/header/header_breadcrumbs.tsx
@@ -35,15 +35,12 @@ import useObservable from 'react-use/lib/useObservable';
 import { Observable } from 'rxjs';
 import { ChromeBreadcrumb } from '../../chrome_service';
 
-import './header_breadcrumbs.scss';
-
 interface Props {
   appTitle$: Observable<string>;
   breadcrumbs$: Observable<ChromeBreadcrumb[]>;
-  isDarkMode?: boolean;
 }
 
-export function HeaderBreadcrumbs({ appTitle$, breadcrumbs$, isDarkMode }: Props) {
+export function HeaderBreadcrumbs({ appTitle$, breadcrumbs$ }: Props) {
   const appTitle = useObservable(appTitle$, 'OpenSearch Dashboards');
   const breadcrumbs = useObservable(breadcrumbs$, []);
   let crumbs = breadcrumbs;