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例
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>盒模型</title>
<style>
.box1{
width: 200px;
height: 200px;
background-color: lightgreen;
padding: 10px;
margin: 20px;
border: 5px solid #666666;
}
</style>
</head>
<body>
<div class="box1">我是内容，内容外边有padding,padding外边有border,border外边有margin</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>元素对齐方式</title>
</head>
<body>
<h3>元素对齐方式</h3>
1.子元素是行内元素 如a,span <br>
a:水平居中,在父元素应用:text-align:center
b:垂直居中:在行内子元素设置行高与父元素登高:line-height:200px
<style>
.box1{
width: 200px;
height: 200px;
background-color: #ffff0a;
text-align: center;
}
.box1 a{
line-height: 200px;
}
</style>
<div class="box1">
<a href="">php中文网</a>
</div>
2.子元素是多行的内联文本
a:水平居中,在父元素应用:text-align:center
b:垂直居中:在父元素:display:table-cell
<style>
.box2{
width: 200px;
height: 200px;
background-color:deepskyblue;
text-align: center;/*水平居中*/
display:table-cell;
vertical-align: middle;/*垂直居中*/
}
</style>
<div class="box2">
<span>php中文网</span>
<br>
<span>www.php.cn</span>
</div>
3.子元素是个块元素
a:水平居中:子元素设置左右外边距自动适用容器
<style>
.box3{
width: 200px;
height: 200px;
background-color: deepskyblue;
display:table-cell;
vertical-align: middle;/*垂直居中*/
}
.box3 .child{
width: 100px;
height: 100px;
background-color: palevioletred;
margin:auto;
}
</style>
<div class="box3">
<div class="child"></div>
</div>
<hr>
4. 子元素是不定宽的块元素
a: 水平居中: 子元素转为行内元素,父级加: text-align:center
b: 垂直居中: 在父元素: display:table-cell;
<style>
.box4{
width: 200px;
height: 200px;
background-color:deepskyblue;
text-align: center;/*水平居中*/
display: table-cell;
vertical-align: bottom; /*位于底部*/
}
ul{
margin: 0;
padding-left: 0;
}
.box4 li{
display:inline;
}
</style>
<div class="box4">
<ul>
<li><a href="">1</a></li>
<li><a href="">2</a></li>
<li><a href="">3</a></li>
<li><a href="">4</a></li>
<li><a href="">5</a></li>
</ul>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>绝对定位</title>
<style>
body{
margin: 0;
}
.box{
width: 200px;
height: 200px;
background-color: wheat;
/*定位父级必须设置定位属性*/
position: absolute;
top: 200px;
left: 400px;
}
.box1{
width: 200px;
height: 200px;
background-color: lightblue;
/*绝对定位元素会脱离文档流*/
position: absolute;
/*top: 20px;/*相对对body定位*/
top: 0;
left: 200px;
}
.box2{
width: 200px;
height: 200px;
background-color: lightgreen;
position: absolute;
top: 200px;
left: 0;
}
.box3{
width: 200px;
height: 200px;
background-color: lightcoal;
position: absolute;
top: 200px;
left: 400px;
}
.box4{
width: 200px;
height: 200px;
background-color: lightgrey;
position: absolute;
top: 400px;
left: 200px;
}
</style>
<div class="box"></div>
<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
<div class="box4"></div>
</head>
<body>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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