<!DOCTYPE html>
<html>
<head>
<title>Заголовок документа</title>
<style>
input {
padding: 15px 100px;
margin:10px 4px;
cursor: pointer;
text-transform: uppercase;
text-align: center;
position: relative;
}
input:hover {
opacity:0.5;}
</style>
</head>
<body>
<input type="button" value="Button"/>
</body>
</html>