Adding mb to card (#297)

Author: stefdworschak

hackathon/templates/hackathon/includes/hackathon_card.html

@@ -2,7 +2,7 @@
 {% load account_tags %}
 {% load custom_tags %}
 
-<article class="card hack-card">
+<article class="card hack-card mb-2">
     <div class="card-body">
 
         <div class="row">