diff --git a/talks/_templates/grid.html b/talks/_templates/grid.html
index 598b5f8..6bf1677 100644
--- a/talks/_templates/grid.html
+++ b/talks/_templates/grid.html
@@ -13,8 +13,12 @@
     text-align: center;
 }
 
+
+.rooms-4 .talk {    width: 25%; }
+.rooms-3 .talk {    width: 33%; }
+.rooms-2 .talk {    width: 50%; }
+.rooms-1 .talk {    width: 100%; }
 td.talk {
-    width: 33%;
     border: 1px solid #444;
     padding: 4px;
 }
@@ -37,7 +41,7 @@ td.talk > a {
 
 </style>
 
-<table class="talk-grid">
+<table class="talk-grid rooms-{{-rooms|length}}">
     <thead>
         <tr>
             <th></th>