Edit in JSFiddle

$(".handle").on("click", function(event){
		$(".panel").toggleClass("hide");
});
<div class="panel">This is a test<br>Hello my name is Larry!</div>
<div class="handle"></div>
.panel{
  height:800px;
  width:120px;
  display:block;
  background-color: lightgrey;
  border-right: solid 1px darkgrey;
  float:left;
  padding:5px;
}
.handle{
  height:60px;
  width:10px;
  margin-top: 45%;
  background-color: darkgrey;
  float:left;
  border-right: solid 1px #737373;
  border-top: solid 1px #737373;
  border-bottom: solid 1px #737373;
  cursor: pointer;
}
.hide{
  display:none;
}