Полезные коды для сайта- Белнет 24

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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: 1;
transition: 0.3s;
}

.btn:hover {opacity: 0.6}
</style>
</head>
<body>

<h2>Fading Buttons - "Fade out Effect"</h2>

<button class="btn">Hover Over Me</button>

</body>
</html>