docs: remove the style tag

README.md

@@ -41,10 +41,9 @@ githubEmojis:
   If `true`, the filter will inject a `<style>` to the html.  
   If `false`, the filter will not inject any style. If you can modify source style files you may turn this off and add them yourself.  
   
-  Below is the injected `<style>`. The class name changes according to option.
+  Below are the injected styles. The class name changes according to option.
 
-  ```html
-  <style>
+  ```css
   .github-emoji {
     position: relative;
     display: inline-block;
@@ -89,7 +88,6 @@ githubEmojis:
   .github-emoji-fallback img {
     opacity: 0 !important;
   }
-  </style>
   ```
 
 - **styles** `object={}` - inline styles. For example: