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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {font-family: Arial, Helvetica, sans-serif;}
.callout {
  position: fixed;
  bottom: 35px;
  right: 20px;
  margin-left: 20px;
  max-width: 300px;
}
.callout-header {
  padding: 25px 15px;
  background: #555;
  font-size: 30px;
  color: white;
}
.callout-container {
  padding: 15px;
  background-color: #ccc;
  color: black
}
.closebtn {
  position: absolute;
  top: 5px;
  right: 15px;
  color: white;
  font-size: 30px;
  cursor: pointer;
}
.closebtn:hover {
  color: lightgrey;
}
</style>
</head>
<body>
<h2>Callout Messages</h2>
<p>Some content text, blabla.</p>