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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.btn {
  background-color: #f4511e;
  border: none;
  color: white;
  padding: 16px 32px;
  text-align: center;
  font-size: 16px;
  margin: 4px 2px;
  opacity: 0.6;
  transition: 0.3s;
}
.btn:hover {opacity: 1}
</style>
</head>
<body>
<h2>Fading Buttons - "Fade in Effect"</h2>
<button class="btn">Hover Over Me</button>
</body>
</html>