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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{margin: 0px;padding: 0px;}
#box1{
width: 300px;
height: 300px;
background-color: #D2691E;
text-align: center;
display: inline-block;
border: dashed;
padding-top: 10px;
}
.box2{
width: 300px;
height: 300px;
background-color: #FFE4C4;
display: inline-block;
text-align: center;
border: dotted;
margin-top: 5px;
}
.box3{
width: 200px;
height: 37px;
background-color: #CCC;
margin-top: 20px;
padding-top: 10px;
line-height: 20px;
text-align: center;
color: blueviolet;
}
.box4{
width: 95px;
height: 100px;
background-color: azure;
margin-top: 15px;
padding-top: 0px;
line-height: 20px;
text-align: center;
border: solid;
display: none;
}
.box3:hover .box4{display: block;}
</style>
</head>
<body>
<div id="box1">第一个盒模型</div>
<div class="box2">第二个盒模型</div>
<div class="box3">导航 鼠标移动上去显示效果
<div class="box4">小菜单</div>
</div>
<video src=""></video>
</body>
</html>点击 "运行实例" 按钮查看在线实例