diff --git a/src/common-elements/fields-layout.ts b/src/common-elements/fields-layout.ts
index 14b5f1d776..a1a24cd2bf 100644
--- a/src/common-elements/fields-layout.ts
+++ b/src/common-elements/fields-layout.ts
@@ -2,6 +2,7 @@ import { transparentize } from 'polished';
 import * as React from 'react';
 
 import styled, {
+  extensionsHook,
   ResolvedThemeInterface,
   StyledComponentClass,
   withProps,
@@ -75,6 +76,8 @@ export const PropertyNameCell = withProps<{ kind?: string }>(PropertyCell.extend
   }
 
   ${({ kind }) => (kind !== 'field' ? 'font-style: italic' : '')};
+
+  ${extensionsHook('PropertyNameCell')};
 `;
 
 export const PropertyDetailsCell = styled.td`
diff --git a/src/common-elements/headers.ts b/src/common-elements/headers.ts
index 4797b2d3e7..96a64aa0cb 100644
--- a/src/common-elements/headers.ts
+++ b/src/common-elements/headers.ts
@@ -1,7 +1,12 @@
 import * as React from 'react';
 import { InterpolationFunction, Styles, ThemeProps } from 'styled-components';
 
-import styled, { css, ResolvedThemeInterface, StyledComponentClass } from '../styled-components';
+import styled, {
+  css,
+  extensionsHook,
+  ResolvedThemeInterface,
+  StyledComponentClass,
+} from '../styled-components';
 
 const headerFontSize = {
   1: '1.85714em',
@@ -18,16 +23,28 @@ export const headerCommonMixin = level => css`
 export const H1 = styled.h1`
   ${headerCommonMixin(1)};
   color: ${props => props.theme.colors.main};
+
+  ${extensionsHook('H1')};
 `;
 
 export const H2 = styled.h2`
   ${headerCommonMixin(2)};
   color: black;
+
+  ${extensionsHook('H2')};
 `;
 
 export const H3 = styled.h2`
   ${headerCommonMixin(3)};
   color: black;
+
+  ${extensionsHook('H3')};
+`;
+
+export const RightPanelHeader = styled.h3`
+  color: ${({ theme }) => theme.rightPanel.textColor};
+
+  ${extensionsHook('RightPanelHeader')};
 `;
 
 export const UnderlinedHeader = styled.h5`
@@ -38,4 +55,6 @@ export const UnderlinedHeader = styled.h5`
   text-transform: uppercase;
   font-size: 0.929em;
   line-height: 20px;
+
+  ${extensionsHook('UnderlinedHeader')};
 `;
diff --git a/src/components/ApiInfo/ApiInfo.tsx b/src/components/ApiInfo/ApiInfo.tsx
index 683dd5288d..e7058a8ae9 100644
--- a/src/components/ApiInfo/ApiInfo.tsx
+++ b/src/components/ApiInfo/ApiInfo.tsx
@@ -7,6 +7,7 @@ import { MiddlePanel, Row } from '../../common-elements/';
 import { Markdown } from '../Markdown/Markdown';
 import { SecurityDefs } from '../SecuritySchemes/SecuritySchemes';
 
+import { StyledMarkdownBlock } from '../Markdown/styled.elements';
 import {
   ApiHeader,
   DownloadButton,
@@ -77,22 +78,23 @@ export class ApiInfo extends React.Component<ApiInfoProps> {
               </DownloadButton>
             </p>
           )}
+          <StyledMarkdownBlock>
+            {((info.license || info.contact || info.termsOfService) && (
+              <InfoSpanBoxWrap>
+                <InfoSpanBox>
+                  {email} {website} {license} {terms}
+                </InfoSpanBox>
+              </InfoSpanBoxWrap>
+            )) ||
+              null}
 
-          {((info.license || info.contact || info.termsOfService) && (
-            <InfoSpanBoxWrap>
-              <InfoSpanBox>
-                {email} {website} {license} {terms}
-              </InfoSpanBox>
-            </InfoSpanBoxWrap>
-          )) ||
-            null}
-
-          {(externalDocs && (
-            <p>
-              <a href={externalDocs.url}>{externalDocs.description || externalDocs.url}</a>
-            </p>
-          )) ||
-            null}
+            {(externalDocs && (
+              <p>
+                <a href={externalDocs.url}>{externalDocs.description || externalDocs.url}</a>
+              </p>
+            )) ||
+              null}
+          </StyledMarkdownBlock>
         </MiddlePanel>
       </Row>
     );
diff --git a/src/components/ApiInfo/styled.elements.ts b/src/components/ApiInfo/styled.elements.ts
index 7852821fd9..583ff9f59e 100644
--- a/src/components/ApiInfo/styled.elements.ts
+++ b/src/components/ApiInfo/styled.elements.ts
@@ -1,7 +1,11 @@
 import { AnchorHTMLAttributes, ClassAttributes, HTMLAttributes } from 'react';
 
 import { H1, MiddlePanel } from '../../common-elements';
-import styled, { ResolvedThemeInterface, StyledComponentClass } from '../../styled-components';
+import styled, {
+  extensionsHook,
+  ResolvedThemeInterface,
+  StyledComponentClass,
+} from '../../styled-components';
 
 const delimiterWidth = 15;
 
@@ -10,6 +14,8 @@ export const ApiInfoWrap = MiddlePanel;
 export const ApiHeader = H1.extend`
   margin-top: 0;
   margin-bottom: 0.5em;
+
+  ${extensionsHook('ApiHeader')};
 `;
 
 export const DownloadButton = styled.a`
@@ -20,6 +26,8 @@ export const DownloadButton = styled.a`
   padding: 4px 8px 4px;
   display: inline-block;
   text-decoration: none;
+
+  ${extensionsHook('DownloadButton')};
 `;
 
 export const InfoSpan = styled.span`
diff --git a/src/components/Markdown/styled.elements.ts b/src/components/Markdown/styled.elements.ts
index 2e94b65d6c..ff743c2b04 100644
--- a/src/components/Markdown/styled.elements.ts
+++ b/src/components/Markdown/styled.elements.ts
@@ -4,6 +4,7 @@ import { InterpolationFunction, Styles, ThemeProps } from 'styled-components';
 import { headerCommonMixin, linkifyMixin } from '../../common-elements';
 import styled, {
   css,
+  extensionsHook,
   ResolvedThemeInterface,
   StyledComponentClass,
   withProps,
@@ -132,4 +133,19 @@ export const StyledMarkdownBlock = withProps<{ dense?: boolean; inline?: boolean
   }
 
   ${linkifyMixin('.share-link')};
+
+  ${extensionsHook('Markdown')};
+
+  a {
+    text-decoration: none;
+    color: ${props => props.theme.links.color};
+
+    &:visited {
+      color: ${props => props.theme.links.visited};
+    }
+
+    &:hover {
+      color: ${props => props.theme.links.hover};
+    }
+  }
 `;
diff --git a/src/components/Redoc/styled.elements.tsx b/src/components/Redoc/styled.elements.tsx
index 4963a13d1a..1716cacb20 100644
--- a/src/components/Redoc/styled.elements.tsx
+++ b/src/components/Redoc/styled.elements.tsx
@@ -32,19 +32,6 @@ export const RedocWrap = styled.div`
   .redoc-markdown h1 {
     padding-top: ${props => props.theme.spacingUnit * 4}px;
   }
-
-  a {
-    text-decoration: none;
-    color: ${props => props.theme.links.color};
-
-    &:visited {
-      color: ${props => props.theme.links.visited};
-    }
-
-    &:hover {
-      color: ${props => props.theme.links.hover};
-    }
-  }
 `;
 
 export const ApiContentWrap = styled.div`
diff --git a/src/components/RequestSamples/RequestSamples.tsx b/src/components/RequestSamples/RequestSamples.tsx
index d895dc41a8..d8d74dcd6f 100644
--- a/src/components/RequestSamples/RequestSamples.tsx
+++ b/src/components/RequestSamples/RequestSamples.tsx
@@ -4,7 +4,7 @@ import { OperationModel } from '../../services/models';
 import { PayloadSamples } from '../PayloadSamples/PayloadSamples';
 import { SourceCodeWithCopy } from '../SourceCode/SourceCode';
 
-import { Tab, TabList, TabPanel, Tabs } from '../../common-elements';
+import { RightPanelHeader, Tab, TabList, TabPanel, Tabs } from '../../common-elements';
 
 export interface RequestSamplesProps {
   operation: OperationModel;
@@ -24,7 +24,7 @@ export class RequestSamples extends React.Component<RequestSamplesProps> {
     return (
       (hasSamples && (
         <div>
-          <h3> Request samples </h3>
+          <RightPanelHeader> Request samples </RightPanelHeader>
 
           <Tabs defaultIndex={0}>
             <TabList>
diff --git a/src/components/ResponseSamples/ResponseSamples.tsx b/src/components/ResponseSamples/ResponseSamples.tsx
index 54f04baa62..aba643954d 100644
--- a/src/components/ResponseSamples/ResponseSamples.tsx
+++ b/src/components/ResponseSamples/ResponseSamples.tsx
@@ -3,7 +3,7 @@ import * as React from 'react';
 
 import { MediaContentModel, OperationModel } from '../../services/models';
 
-import { Tab, TabList, TabPanel, Tabs } from '../../common-elements';
+import { RightPanelHeader, Tab, TabList, TabPanel, Tabs } from '../../common-elements';
 import { PayloadSamples } from '../PayloadSamples/PayloadSamples';
 
 export interface ResponseSamplesProps {
@@ -23,7 +23,7 @@ export class ResponseSamples extends React.Component<ResponseSamplesProps> {
     return (
       (responses.length > 0 && (
         <div>
-          <h3> Response samples </h3>
+          <RightPanelHeader> Response samples </RightPanelHeader>
 
           <Tabs defaultIndex={0}>
             <TabList>
diff --git a/src/services/RedocNormalizedOptions.ts b/src/services/RedocNormalizedOptions.ts
index f1a7373ce3..f5f65505b4 100644
--- a/src/services/RedocNormalizedOptions.ts
+++ b/src/services/RedocNormalizedOptions.ts
@@ -98,7 +98,14 @@ export class RedocNormalizedOptions {
   unstable_ignoreMimeParameters: boolean;
 
   constructor(raw: RedocRawOptions) {
+    let hook;
+    if (raw.theme && raw.theme.extensionsHook) {
+      hook = raw.theme.extensionsHook;
+      raw.theme.extensionsHook = undefined;
+    }
     this.theme = resolveTheme(mergeObjects({} as any, defaultTheme, raw.theme || {}));
+    this.theme.extensionsHook = hook;
+
     this.scrollYOffset = RedocNormalizedOptions.normalizeScrollYOffset(raw.scrollYOffset);
     this.hideHostname = RedocNormalizedOptions.normalizeHideHostname(raw.hideHostname);
     this.expandResponses = RedocNormalizedOptions.normalizeExpandResponses(raw.expandResponses);
diff --git a/src/styled-components.ts b/src/styled-components.ts
index a9dee9a9fe..74466f4225 100644
--- a/src/styled-components.ts
+++ b/src/styled-components.ts
@@ -1,7 +1,7 @@
 import { ComponentClass, StatelessComponent } from 'react';
 import * as styledComponents from 'styled-components';
 
-import { ResolvedThemeInterface } from './theme';
+import { ResolvedThemeInterface, ThemeInterface } from './theme';
 
 export { ResolvedThemeInterface };
 
@@ -56,3 +56,12 @@ export const media = {
 export { css, injectGlobal, keyframes, ThemeProvider, withProps };
 export { StyledComponentClass } from 'styled-components';
 export default styled;
+
+export function extensionsHook(styledName: string) {
+  return props => {
+    if (!props.theme.extensionsHook) {
+      return;
+    }
+    return props.theme.extensionsHook(styledName, props);
+  };
+}
diff --git a/src/theme.ts b/src/theme.ts
index 526c69b54c..ffefc3d28c 100644
--- a/src/theme.ts
+++ b/src/theme.ts
@@ -2,6 +2,7 @@ import { adjustHue, desaturate, lighten, transparentize } from 'polished';
 
 const defaultTheme: ThemeInterface = {
   spacingUnit: 20,
+
   breakpoints: {
     small: '50rem',
     medium: '85rem',
@@ -74,6 +75,7 @@ const defaultTheme: ThemeInterface = {
   rightPanel: {
     backgroundColor: '#263238',
     width: '40%',
+    textColor: '#ffffff',
   },
 };
 
@@ -187,7 +189,10 @@ export interface ResolvedThemeInterface {
   rightPanel: {
     backgroundColor: string;
     width: string;
+    textColor: string;
   };
+
+  extensionsHook?: (name: string, props: any) => string;
 }
 
 export type primitive = string | number | boolean | undefined | null;