标记:<div></div>
一行始终只有一个div标记
没有特征性,css更容易控制
border是复合属性:
1.border-width
2.border-style:none(默认值)无边框,hidden,dotted,dashed,solid,double,groove,ridge,inset,outset
3.border-color
//style.css
#first{
width:300px;
height:200px;
border:1px solid #fba;
}
<!doctype html>
<html>
<head>
<title>div的概念</title>
<link rel = "stylesheet" href = "style.css" type = "css/style.css"/>
</head>
<body>
<div id="first">第一个div</div>
<div>第二个div</div>
<div>第三个div</div>
</body>
</html>
页面水平居中效果 margin{0 auto}
//style.css
#bannar{
width:300px;
height:200px;
border:1px solid #fba;
margin:0 auto;
}
<html>
<head>
<title>div的概念</title>
<link rel = "stylesheet" href = "style.css" type = "css/style.css"/>
</head>
<body>
<div id="bannar">第一个div</div>
</body>
</html>