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当您单击#video_background或#navdiv#infowrap淡入时。我想要但我发现几乎不可能保持与我现在完全相同的布局，#infowrap但在右下角通过 div 打一个“洞”，这样你就可以看到#video_background它洞。我已经考虑将 png 放在一个单独的 div 中，或者将 png 作为背景，但我无法让它工作。有任何想法吗？这是我的html：

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8"/>
        <meta name="description" content=""/>
        <meta name="keywords"content=""/>
        <title></title>
        <link href="css/main.css" rel="stylesheet" type="text/css"/>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
    </head>


    <body>
<header>
            <div id="nav">
                <p><a id="btn" href="#">+</a></p>
            </div>
        </header>
        <div id="container">
            <div id="infowrap">
                <div class="mainwrap">

                    <div class="smallwrap">
                        <p>Mustache art party pug whatever mixtape, pork belly sriracha gentrify swag. Try-hard selvage butcher high life, hashtag DIY ennui.</p>
                    </div>

                    <div class="smallwrap">
                        <p>Mustache art party pug whatever mixtape, pork belly sriracha gentrify swag. Try-hard selvage butcher high life, hashtag DIY ennui.</p>
                    </div>

                    <div class="smallwrap">
                        <p>Mustache art party pug whatever mixtape, pork belly sriracha gentrify swag. Try-hard selvage butcher high life, hashtag DIY ennui.</p>
                    </div>

                    <div class="smallwrap">
                        <p>Mustache art party pug whatever mixtape, pork belly sriracha gentrify swag. Try-hard selvage butcher high life, hashtag DIY ennui.</p>
                    </div>
                </div>
            </div>
        </div>
<video id="video_background" src="vid/147000037.mp4" autoplay loop>
<script>
                $('#video_background, #btn').on('click', function(){
                    $('#nav').toggleClass('rotate');
                });
        </script>




        <script>
        $(document).ready(function(){
          $("#video_background, #nav").click(function(){
            $("#infowrap").fadeToggle(250);
          });
        });
        </script>
    </body>






</html>

我的CSS：

* {
    margin: 0;
    padding: 0;
}

body {
    width: 100%;
    height: 100%;
    margin: 0;
    font-family: "HelveticaNeue-UltraLight","HelveticaNeue-Light","Helvetica Neue",Helvetica,Arial,sans-serif;
}

header {
    z-index: 999;
    display: block;
    height: auto;
    width: 100%;
    position: fixed;
}

header a {
    text-decoration: none;
    font-size: 2.0em;
    color: #000000;
}

#nav {

    position: relative;
    float: right;
    top: 15px;
    right: 25px;
    color: #000000;
}

#video_background {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    z-index: -1000;
}

#container {
    height: 100%;
    width: 100%;
    display: block;
}

#infowrap {
    background: rgba(25,250,255,0.96);
    z-index: 900;
    display: none;
    position: fixed;
    top:10px;left:10px;right:10px;bottom:10px;
    vertical-align: center;
}

.mainwrap {
    width: 540px;
    height: 540px;
    margin: 50px auto 0 auto;
}

.smallwrap {
    width: 250px;
    height: 250px;
    margin: 10px;
    float: left;
    position: relative;
}
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