css 盒子模型应用

盒子模型应用
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>盒子模型应用</title>
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
        }

        .top {
            width: 100%;
            height: 50px;
            background-color: black;
        }

        .top_content {
            width: 75%;
            height: 50px;
            margin: 0px auto;
            background-color: blue;
        }

        .body {
            margin: 20px auto;
            width: 75%;
            height: 1500px;
            background-color: blanchedalmond;
        }

        .body_img {
            width: 100%;
            height: 400px;
            background-color: darkorange;
        }

        .body_content {
            width: 100%;
            height: 111px;
            background-color: blueviolet;
        }

        .body_no {
            width: 100%;
            height: 50px;
            background-color: aqua;
        }

        .footing {
            width: 75%;
            height: 400px;
            background-color: indigo;
            margin: 0px auto;
        }

        .footing_content {
            width: 100%;
            height: 330px;
            background-color: darkseagreen;
        }

        .footing_subnav {
            width: 100%;
            height: 70px;
            background-color: black;
        }
    </style>
</head>
<body>
    <div class="top">
        <div class="top_content">
        </div>
    </div>
    <div class="body">
        <div class="body_img"></div>
        <div class="body_content">
            <div class="body_no"></div>
        </div>
    </div>
    <div class="footing">
        <div class="footing_content"> </div>
        <div class="footing_subnav"> </div>
    </div>
</body>
</html>