效果圖：
html代碼：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>盒子模型的應用</title>
<link rel="stylesheet" type="text/css" href="style.css">
</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>
css代碼：
*{
margin: 0px;
padding: 0px;
}
.top{
width:100%;
height:50px;
background-color: black;
}
.top_content{
width: 75%;
height:50px;
margin:0 auto;
background-color:blue;
}
.body{
margin:20px auto;
width:75%;
height: 1500px;
background-color: bisque;
}
.body_img{
width:100%;
height:400px;
background-color: darkorange;
}
.body_content{
width:100%;
height:1100px;
background-color: blueviolet;
}
.body_no{
width: 100%;
height:50px;
background-color: aqua;
}
.footing{
width:75%;
height: 400px;
background-color: darkorchid;
margin:0 auto;
}
.footing_content{
width:100%;
height: 350px;
background-color: darkseagreen;
}
.footing_subnav{
width:100%;
height:70px;
background-color: black;
}