<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>透明度</title><style>div{width: 500px;height: 500px;background-color: orange;/* 直接看不到元素了 */opacity: 0;/* 默认，都可以看到 */opacity: 1;/* 元素变得模糊 */opacity: 0.5;}</style>
</head>
<body><div><img src="./day08/images/phone.png" alt=""></div>
</body>
</html>
