make code question link explicit

app.py

@@ -70,7 +70,12 @@ You are probing your code generation model on a program synthesis benchmark and
 <br/>
 <br/>
 What’s the pass@2 metric (in percent) as introduced in the 
-<a href="https://arxiv.org/abs/2107.03374" target="_blank"><code>Codex paper</a></code> (see section 2.1)?
+Codex paper (see section 2.1)?
+<br/>
+<br/>
+References
+<br/>
+- Codex paper: https://arxiv.org/abs/2107.03374
 """
 
 internships = {