update fundamentals video widths for responsiveness

Author: hmillersarah

ims-tm.html

@@ -129,7 +129,7 @@ <h2>Introducing IMS Transaction Manager</h2>
         </div>
         <div class="pure-u-1">
           <div class="pure-g pure-g-pad-v">
-            <div class="pure-u-1 pure-u-md-1-2">
+            <div class="pure-u-1 pure-u-lg-1-2">
               <h4>Fundamentals of IMS TM Part 1</h4>
               <p>
                 <a
@@ -157,7 +157,7 @@ <h4>Fundamentals of IMS TM Part 1</h4>
                 </a>
               </div>
             </div>
-            <div class="pure-u-1 pure-u-md-1-2">
+            <div class="pure-u-1 pure-u-lg-1-2">
               <h4>Fundamentals of IMS TM Part 2</h4>
               <p>
                 <a