Update README.md

Author: sadanandpai

README.md

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-<h1 align="center">
+<div align="center">
+	<h1>
     JavaScript Modern Interview Code Challenges 2021
-	<a href="https://twitter.com/intent/tweet?text=A%20collection%20of%20modern%20interview%20code%20challenges%20on%20JavaScript&url=https://github.com/sadanandpai/javascript-code-challenges&hashtags=javascript,interview,HTML5,CSS,reactjs,angularjs,jobseekers,js" target="_blank"><img src="https://img.shields.io/twitter/url/http/shields.io.svg?style=social" alt="tweet" /></a>
+	<a href="https://twitter.com/intent/tweet?text=A%20collection%20of%20modern%20interview%20code%20challenges%20on%20JavaScript&url=https://github.com/sadanandpai/javascript-code-challenges&hashtags=javascript,interview,HTML5,CSS,reactjs,angularjs,jobseekers,js" target="_blank"><img src="https://img.shields.io/twitter/url/http/shields.io.svg?style=social" alt="tweet" /></a></h1>
+	<h3>Collection of modern interview code challenges on JavaScript suitable for</h3>
+    	<h4>Interviewees | Interviewers | Knowledge test | Practice</h4>
+</div>
 
-</h1>
 <div align="center">
-    <a href="#javascript-modern-interview-code-challenges-by-topic"><img src="assets/banner.jpg" alt="banner" /></a>
+    <a href="#javascript-modern-interview-code-challenges-by-topic"><img src="assets/banner.png" alt="banner" width="500px"/></a>
 </div>
 
 <div align="center">
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 </div>
 
 <div align="center">
-    <h3>This is a collection of modern interview code challenges on JavaScript suitable for</h3>
-    <h4>Interviewees | Interviewers | Knowledge test | Practice</h4>
 	<p>Show your support by giving a ⭐ to this repo</p>
 	<h5>Feel free to connect with me on <a href="https://linkedin.com/in/sadanandpai" target="blank"><img align="center" src="https://cdn.jsdelivr.net/npm/simple-icons@3.0.1/icons/linkedin.svg" alt="sadanandpai" height="20" width="20" /></a></h5>
 	<a href="https://www.buymeacoffee.com/sadanandpai" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: 41px !important;width: 174px !important;box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;-webkit-box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;" ></a>