improvements

index.html

@@ -156,7 +156,7 @@ <h2><u>Introduction to Computational Astrophysics</u></h2>
       <br>
       <p>This is a brief description of the research topic. It highlights the significance and implications of the research.</p>
       <p>For more detailed instructions on how to proceed, please visit the 
-         <a href="instructions.html" class="button">Instructions Page</a>.
+         <a href="instructions.html">Instructions Page</a>.
       </p>
     </div>
   </div>