<!DOCTYPE html>
<html>
<head>
<title>Заголовок документа</title>
<style>
.button {
background: #1c87c9;
color: white;
font-weight: bold;
padding: 5px;
border-radius: 4px;
border: 1px solid #666;
text-decoration: none;
}
</style>
</head>
<body>
<a href="#" class="button">BUTTON</a>
</body>
</html>