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<div id="wrapper">
  <div class="container">
    <a href="#" id="clicktest">First PEN</a>
  </div>
</div>
<!-- 下記は説明 -->
<p>
  Explain
</p>

$(function() {

  /* Variable Setting */
  var runFunc;

  /* Function Setting */
  runFunc = function() {
    $(".container").html("test2");
  };

  /* Event Lister Setting */
  $("#clicktest").click(runFunc);

});

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

body {
  background : #fefefe;
  font-family : sans-serif;
}

p{
    position: fixed;
    bottom:0;
  padding-left: 15px;
}

#wrapper{
  padding:0px 15px;
}

.container{
  color:#333;
}