写一个案例， 演示css中的选择器优先级(忽略js)
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<style>
div{
background-color: red;
}
.color{
width:100px;
height:100px;
background-color: blue;
}
#color{
background-color: green;
}
</style>
<div class="color" id="color">
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
写一个盒模型的简单案例，体会padding/border的简写规则
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<style>
.box{
width:100px;
height:100px;
background-color:red;
border:2px solid #000;
padding: 10px 20px 10px 20px;
}
</style>
<div class="box" >
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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