diff --git a/_includes/slack_invite.html b/_includes/slack_invite.html
index 0d46bd320..fb10c9e3a 100644
--- a/_includes/slack_invite.html
+++ b/_includes/slack_invite.html
@@ -1,5 +1,5 @@
 <h4><i class="fa fa-lg fa-slack"></i>&nbsp;Enter your email to join our Slack community</h4>
-<div id='div-slack-join' style='text-align:left;align-controls:center;padding: 8px;'>
+<div id='div-slack-join' style='text-align:left;align-content:center;padding: 8px;'>
     <label for='emailaddr'>Email Address</label><br>
     <input style='line-height: 24px;margin-bottom:8px;' id='emailaddr' type='email'><br>
     <button class="cta-button dark" id="btn-join-slack">Join</button>