add link to bitcoin infra

public/index.html

@@ -123,6 +123,9 @@
           <a href="https://github.com/pmartincalvo/dni" target="_blank" rel="noopener noreferrer">My Python package to
             handle Spanish DNIs better</a>
         </li>
+        <li>
+            <a href="https://bitcoininfra.contrapeso.xyz" target="_blank" rel="noopener noreferrer">My open access Bitcoin infrastructure that you can use freely.</a> It includes access to the peer port of my Bitcoin node, an Electrum server and a mempool.space instance.
+        </li>
       </ul>
       <p>
         There are also some other projects that I generally keep private but

public/styles.css

@@ -7,7 +7,8 @@ body {
 
 h1,
 h2,
-h3 {
+h3,
+h4 {
     text-align: center;
 }