<!DOCTYPE html>
<html>
<head>
<title>Заголовок документа</title>
<style>
#mybutton a {
border-bottom: 3px dashed #8ebf42;
}
.button {
background: #1c87c9 !important;
color: white !important;
font-weight: bold !important;
padding: 5px !important;
border-radius: 4px !important;
border: 3px solid #666 !important;
text-decoration: none !important;
}
</style>
</head>
<body>
<section id="mybutton">
<p>This is a <a href="#" class="button">BUTTON</a>
</p>
</section>
</body>
</html>