代码示例：（标识：css_buttons_shadow）
<!DOCTYPE html>
<html>
<head>
<style>
.button {
background-color: #4CAF50; /* Green */
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
-webkit-transition-duration: 0.4s; /* Safari */
transition-duration: 0.4s;
}
.button1 {
box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
}
.button2:hover {
box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
}
</style>
</head>
<body>
<h1>阴影按钮</h1>
<p>使用 box-shadow 属性为按钮添加阴影：</p>
<button class="button button1">阴影按钮</button>
<button class="button button2">悬停时的阴影</button>
</body>
</html>
