lovecoding
/
W250913


			
				
					
						
						
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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: 100px;
            height: 100px;
            background-color: red;
            /* opacity: 0; */
            display: none;
        }
        button:hover + .box{
            display: block;
        }
    </style>
</head>
<body>
    <button>显示/隐藏</button>
    <div class="box"></div>
    hello
</body>
</html>