[style] [upgrade] moved to bootstrap 3
diff --git a/website/templates/html/footer.html b/website/templates/html/footer.html
index 2f1c7fe..7260fa5 100644
--- a/website/templates/html/footer.html
+++ b/website/templates/html/footer.html
@@ -38,7 +38,7 @@
{{ address }}
{% endif %}
<p><div class="input-append" style="text-align: center; margin:30px 0px;">
- <input class="span3" id="footer-subscribe-email" type="text" placeholder="Your email address...">
+ <input class="col-span-3" id="footer-subscribe-email" type="text" placeholder="Your email address...">
<button class="btn" type="button" id="footer-subscribe-button">Stay Updated</button>
</div></p>
<script>