Need help adding "read more" "read Less" text to my accordion
Hi all,
I have an accordion with text in the bar. I would like it to say read more and read less when expanded. Below is my code. How would I be able to do this? CSS?

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Slide Panels</title>
<link href="https://fonts.googleapis.com/css?family=Raleway:400,600" rel="stylesheet">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.1/css/font-awesome.min.css">
<link href="https://fonts.googleapis.com/css?family=Roboto:300,400" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Roboto+Slab:300,400,700" rel="stylesheet">
<style>
}
* {
box-sizing: border-box;
}
.accordion_wrapper {
width: 75%;
margin: 0 auto;
}
@media screen and (max-width: 768px) {
.accordion_wrapper {
width: 90%;
}
}
@media screen and (max-width: 480px) {
.accordion_wrapper {
width: 95%;
}
}
.accordion {
position: relative;
border-radius: 50px;
padding: 10px;
margin: 0 0 10px 0;
}
.accordion h3 {
margin: 0;
padding: 0;
font-size: 21px;
font-weight: 400;
text-align: center;
font-family: Roboto, sans-serif;
}
.accordion h3:after {
float: right;
content: '\002B';
color: #777;
font-weight: bold;
font-size: 25px;
line-height:30px;
}
.active h3:after {
float: right;
content: "\2212";
color: #777;
font-weight: bold;
font-size: 30px;
font-family: Roboto, sans-serif;
}
.accordion_panel {
padding: 20px 30px 30px 30px;
color: #fff;
text-align: left;
}
.accordion_panel h3 {
margin: 0;
padding: 0 0 15px 0;
font-size: 25px;
font-weight: 600;
text-align: left;
}
.accordion_panel p {
margin: 0;
padding: 0;
text-align: left;
}
.accordion_panel li {
margin: 0 0 15px 0px;
text-align:left;
}
.accordion_panel ul {
margin: 0 0 0 15px;
text-align:left;
}
.one {
background-color: #ffc627;
}
.two {
background-color: #99cccc;
}
.three {
background-color: #0099cc;
}
</style>
</head>
<body>
<div class="accordion_wrapper">
<div class="accordion one">
<h3>(place holder)</h3>
</div>
<!-- end accordion/one -->
<div class="accordion_panel">
<span style="font-size:20px;line-height:2;font-family: Roboto, sans-serif;font-weight:300;color:#000000;"><i aria-hidden="true" class="fa fa-chevron-right"> </i> physician-led structure with effective physician champions<br />
<i aria-hidden="true" class="fa fa-chevron-right"> </i> high levels of trust between administrative and clinical leaders<br />
<i aria-hidden="true" class="fa fa-chevron-right"> </i> collaborative culture that encourages cost-effective care</span><span style="font-size:16px;font-family: Roboto, sans-serif;"> </span>
<p> </p>
</div>
<!-- end accordion_panel -->
</div>
<!-- end accordion_wrapper -->
</body>
</html>
