diff --git a/docs/src/modules/components/MarkdownElement.js b/docs/src/modules/components/MarkdownElement.js
index 598bef4760bd36..a7d6b409005308 100644
--- a/docs/src/modules/components/MarkdownElement.js
+++ b/docs/src/modules/components/MarkdownElement.js
@@ -99,15 +99,11 @@ const markedOptions = {
         break;
     }
 
-    if (!prismLanguage && language) {
+    if (!prismLanguage) {
       throw new Error(`unsuppored language: "${language}", "${code}"`);
     }
 
-    if (prismLanguage) {
-      return prism.highlight(code, prismLanguage);
-    }
-
-    return code;
+    return prism.highlight(code, prismLanguage);
   },
   renderer,
 };
@@ -141,7 +137,7 @@ const styles = theme => ({
       fontSize: 14,
       borderRadius: 2,
     },
-    '& pre > code': {
+    '& code[class*="language-"]': {
       backgroundColor: '#333',
       color: '#fff',
     },
diff --git a/docs/src/pages/guides/minimizing-bundle-size/minimizing-bundle-size.md b/docs/src/pages/guides/minimizing-bundle-size/minimizing-bundle-size.md
index 87e88dfad7e8b1..07c47c643465ad 100644
--- a/docs/src/pages/guides/minimizing-bundle-size/minimizing-bundle-size.md
+++ b/docs/src/pages/guides/minimizing-bundle-size/minimizing-bundle-size.md
@@ -175,7 +175,7 @@ If you are using Create React App, you will need to use a couple of projects tha
 
   Note: You may run into errors like these:
 
-  ```
+  ```sh
     Module not found: Can't resolve '@material-ui/core/makeStyles' in '/your/project'
     Module not found: Can't resolve '@material-ui/core/createStyles' in '/your/project'
   ```