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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- <style>
- .box{
- width: 400px;
- height: 400px;
- border:3px solid black;
- }
- .box:hover .box2{
- display: none;
- }
- .box2:hover{
- display: none;
- }
- .box2{
- width: 100px;
- height: 100px;
- /* background-color: rgba(0, 0, 0, 0); */
- background-color: red;
- /* opcity 控制元素的透明度 取值范围0-1 */
- /* opacity: 0.9; */
- /* display: none; */
- }
- </style>
- </head>
- <body>
- <div class="box">
- <div class="box2"></div>
- <span>hello</span>
- </div>
- </body>
- </html>
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