Webmastertoolbag Tryit Editor

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
div {
  margin-bottom: 15px;
  padding: 4px 12px;
}

.danger {
  background-color: #ffdddd;
  border-left: 6px solid #f44336;
}

.success {
  background-color: #ddffdd;
  border-left: 6px solid #04AA6D;
}

.info {
  background-color: #e7f3fe;
  border-left: 6px solid #2196F3;
}

.warning {
  background-color: #ffffcc;
  border-left: 6px solid #ffeb3b;
}
</style>
</head>
<body>

<h2>Notes</h2>
<div class="danger">
  <p><strong>Danger!</strong> Some text...</p>
</div>

<div class="success">
  <p><strong>Success!</strong> Some text...</p>
</div>

<div class="warning">
  <p><strong>Warning!</strong> Some text...</p>
</div>