伪类，图片中出现文字·

鼠标放进图片之后：
鼠标没放进图片之前：
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .touch{
             200px;
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .touch .content{
            position: absolute;
            top:0;
            height: 0;
            left: 0;
            bottom: 0;
            opacity: 0.6;
            color: black;
            text-align: center;
            visibility: hidden;
        }
        .touch:hover .content{
            visibility: visible;
        }
        .touch .content .c1{
            font-size: 32px;
            padding: 30px 0;
        }
    </style>
</head>
<body>
    <div class="touch">
        <div><img src="2.jpg"></div>
        <div class="content">
            <div class="c1">NiHao</div>
            <div class="c2">Wyc</div>
        </div>
    </div>
</body>
</html>



# visibility: hidden;       透明度隐藏
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