Fix colour striping on speakers page.

speakers.html

@@ -161,7 +161,7 @@ <h2>Debugging HTTP</h2>
         </div>
     </div>
 
-    <div class="speaker" id="rowan">
+    <div class="speaker yellow clearfix" id="rowan">
 
         <img class="hidden-phone" src="/img/rowan.jpg" alt="Rowan Merewood" />
 
@@ -177,7 +177,7 @@ <h2>Building Better Developers</h2>
         </div>
     </div>
 
-    <div class="speaker yellow clearfix" id="phil">
+    <div class="speaker clearfix" id="phil">
 
         <img class="hidden-phone" src="/img/phil.jpg" alt="Phil Leggetter" />
 
@@ -192,7 +192,7 @@ <h2>Real Time Web Apps in the Wild</h2>
         </div>
     </div>
 
-    <div class="speaker" id="alvaro">
+    <div class="speaker yellow clearfix" id="alvaro">
 
         <img class="hidden-phone" src="/img/alvaro.jpg" alt="Alvaro Videla" />
 
@@ -208,7 +208,7 @@ <h2>Scaling Applications with RabbitMQ</h2>
         </div>
     </div>
 
-    <div class="speaker yellow clearfix" id="graeme">
+    <div class="speaker clearfix" id="graeme">
 
         <img class="hidden-phone" src="/img/graeme.jpg" alt="Graeme Mathieson" />
 
@@ -226,7 +226,7 @@ <h2>Automate All The Things!</h2>
         </div>
     </div>
 
-    <div class="speaker clearfix" id="robert">
+    <div class="speaker yellow clearfix" id="robert">
 
         <img class="hidden-phone" src="/img/robert.jpg" alt="Robert Nyman" />