diff --git a/index.html b/index.html
index 6e626e8..4fed27b 100644
--- a/index.html
+++ b/index.html
@@ -208,12 +208,12 @@
 
   <!-- there are a few shorthand columns widths as well -->
   <div class="row">
-    <div class="one-third columns">1/3</div>
-    <div class="two-thirds columns">2/3</div>
+    <div class="one-third column">1/3</div>
+    <div class="two-thirds column">2/3</div>
   </div>
   <div class="row">
-    <div class="one-half columns">1/2</div>
-    <div class="one-half columns">1/2</div>
+    <div class="one-half column">1/2</div>
+    <div class="one-half column">1/2</div>
   </div>
 
 </div>