<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.btn {
border: none;
color: white;
padding: 14px 28px;
font-size: 16px;
cursor: pointer;
}
.success {background-color: #04AA6D;}
.success:hover {background-color: #46a049;}
.info {background-color: #2196F3;}
.info:hover {background: #0b7dda;}
.warning {background-color: #ff9800;}
.warning:hover {background: #e68a00;}
.danger {background-color: #f44336;}
.danger:hover {background: #da190b;}
.default {background-color: #e7e7e7; color: black;}
.default:hover {background: #ddd;}
</style>
</head>
<body>
<h1>Alert Buttons</h1>
<button class="btn success">Success</button>
<button class="btn info">Info</button>
<button class="btn warning">Warning</button>
<button class="btn danger">Danger</button>
<button class="btn default">Default</button>
</body>
</html>