try

lib/imp.js

 
 function simple_carousel(selector){
-  return '<div class="col-sm-3 col-md-3"></div><div class="col-sm-6 col-md-6"><div id="${selector}" class="carousel slide" data-interval="false"><ol class="carousel-indicators"></ol><div class="carousel-inner" role="listbox"></div></div><a class="left carousel-control" role="button" data-slide="prev"><span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span><span class="sr-only">Previous</span></a><a class="right carousel-control" role="button" data-slide="next"><span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span><span class="sr-only">Next</span></a></div><div class="col-sm-3 col-md-3"></div>';
+  return '<div class="col-sm-2 col-md-2"><a class="left carousel-control" role="button" data-slide="prev">
+      <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
+      <span class="sr-only">Previous</span>
+  </a></div>
+  <div class="col-sm-8 col-md-8">
+  <div id="${selector}" class="carousel slide" data-interval="false"><ol class="carousel-indicators"></ol>
+    <div class="carousel-inner" role="listbox"></div></div>
+    <a class="right carousel-control" role="button" data-slide="next">
+        <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span><span class="sr-only">Next</span></a></div>
+  <div class="col-sm-2 col-md-2"></div>';
 }