1 files changed, 1 insertions, 1 deletions
diff --git a/2pi.html b/2pi.html
index bbf0a43..95b4fa7 100644
--- a/2pi.html
+++ b/2pi.html
@@ -14,7 +14,7 @@
 
         <h2>π calculator</h2>
         <p>Since 2π day is today (6/28), here's a π/2π calculator. Draw a circle, then find out how well your circle approximates π!<br>
-        <button onclick="calculate();">Calculate π</button><br>
+        <button class="btn btn-sm btn-primary" onclick="calculate();">Calculate π</button><br>
         <div id="info"></div>
         <script src="js/2pi.js"></script>
     </body>