Update codedex-github-edu.mdx

Author: sonnynomnom

blogs/2024/codedex-github-edu.mdx

@@ -68,7 +68,7 @@ If you are NOT already verified via GitHub Education, follow these steps:
 Welcome to the Club! Once you have a Club membership, you should see a rainbow CLUB logo appear in your User Dashboard.
 
 <div style={{ display: "flex", justifyContent: "center", marginBottom: "1.2rem", transform: "scale(.9)" }}>
-  <a className="nes-btn is-warning" href="https://www.codedex.io/github-students" target="_blank" and rel="noopener noreferrer">Sign Up Now</a>
+  <a href="https://www.codedex.io/github-students" style={{ all: "unset" }} target="_blank" and rel="noopener noreferrer"><Button variant="yellow">Sign up now</Button></a>
 </div>
 
 Hope you enjoy this partnership, and make sure to tell all your CS friends!