--定义样式 border-style:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style type="text/css">
.block {
width: 200px;
height：200px;
padding: 30px;
background-color: red;
border-style:solid;
border-width:10px;
border-color:green;
//border:10px solid yellow;
//border-radius: 20px;
//margin:auto;
}
</style>
</head>
<body>
<div class="block">border</div>
</body>
</html>
--兄弟元素margin合并
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
body {
background: pink;
}
.div {
//overflow: hidden;
//margin: 0 auto;
width: 300px;
height: 600px;
background: #aaa;
}
.div1 {
width: 200px;
height: 200px;
background: red;
//margin: 50px 0px;
//float: left;
}
.div2 {
width: 200px;
background: green;
//margin: 50px 0px;
height: 200px;
//float: left;
}
</style>
</head>
<body>
<div class="div">
<div class="div1"></div>
<div class="div2"></div>
</div>
</body>
</html>
----父子元素margin合并
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style type="text/css">
body {
background: pink;
}
.div1 {
//margin-top: 20px;
width: 450px;
height: 450px;
background: #aaa;
//overflow:hidden;
//border:1px solid red;
}
.div2 {
width: 200px;
height: 200px;
background: red;
//margin-top: 50px;
}
</style>
</head>
<body>
<div class="div1">
<div class="div2"></div>
</div>
</body>
</html>
--box-sizing
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style type="text/css">
.group {
/* background-color: blue; */
overflow: hidden;
}
.block {
width: 33.33%;
padding: 20px;
float: left;
//box-sizing: border-box ;
}
.red {
background-color: red;
//box-sizing: conten-box ;
//overflow: hidden;
//outline:#00FF00 dotted thick;
}
.green {
background-color: green;
}
.gray {
background-color: gray;
//box-sizing: border-box ;
}
</style>
</head>
<body>
<div class="group">
<div class="block red">1</div>
<div class="block green">2</div>
<div class="block gray">3</div>
</div>
</body>
</html>
--盒子显示（display）类型
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
.background{
background-color:#F60;
margin-bottom:5px;
margin-left:5px;
height:50Px;
}
.display1{
display:block;
}
.display2{
display:inline ;
//display:inline-block;
}
</style>
<div class="background ">Div默认为 block</div>
<div class="background ">Div默认为 block</div>
<div class="background ">Div默认为 block</div>
<div class="background display2">修改为 inline</div>
<div class="background display2">修改为 inline</div>
<div class="background display2">修改为 inline</div>
<span class="background display1">加了block属性</span>
<span class="background display1">加了block属性</span>
<span class="background display1">加了block属性</span>
<span class="background">没加block属性</span>
<span class="background">没加block属性</span>
<span class="background">没加block属性</span>
</body>
</html>
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