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Teacher's comments：
Collection
Collection
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>盒模型</title>
<style>
.box1 {
margin:10px 20px 30px 40px;
padding: 10px 20px 30px 40px;
width: 500px;
height: 200px;
background-color: lightblue;
text-align: center;
}
.box1 span {
line-height: 200px;
}
.box2 {
width: 500px;
height: 200px;
background-color: lightpink;
display: table-cell;
text-align: center;
vertical-align: middle;
}
.box3 {
width: 400px;
height: 400px;
background-color: #aaa;
display: table-cell;
vertical-align: middle;
}
.box3 .box4 {
width: 200px;
height: 200px;
background-color: lime;
margin: auto;
}
.box5{
width: 600px;
height: 140px;
text-align: center;
display: table-cell;
vertical-align: middle;
background-color: wheat;
}
.box5 ul {
padding: 0;
margin: 0;
}
.box5 li {
list-style-type: none;
display: inline;
padding: 0 10px;
}
#demo div {
width: 150px;
height: 150px;
background-color: coral;
}
#demo div:nth-of-type(odd) {
background-color: green;
}
#demo div:nth-of-type(1) {
position: relative;
left: 150px;
}
#demo div:nth-of-type(2) {
position: relative;
left: 150px;
}
#demo div:nth-of-type(3) {
position: relative;
top: -150px;
background-color: skyblue;
}
#demo div:nth-of-type(4) {
position: relative;
left: 150px;
top: -150px;
background-color: brown;
}
#demo div:nth-of-type(5) {
position: relative;
left: 300px;
top: -450px;
background-color: lawngreen;
}
</style>
</head>
<body>
<!-- 子元素为单行行内元素时，通过父级中text-align:center来设置水平居中，行内子元素中设置行高line-height与父元素等高可设置垂直居中 -->
<div class="box1"><span>padding简写方式顺序为:up,right,bottom,left</span></div>
<!-- 子元素为多行行内元素时，通过父级中text-align:center来设置水平居中，设置父元素的display:table-cell及vertical-align:middle来实现垂直居中 -->
<div class="box2"><span>margin简写方式顺序为:<br>up,right,bottom,left</span></div>
<br>
<div class="box3"><div class="box4">子元素为块元素时，设置子元素左右外边距自适应margin:auto,设置父元素display:table-cell及vertical-align:middle来实现垂直居中</div></div>
<br>
<!-- 子元素为不定宽的块元素时，在父级中text-align:center来设置水平居中，设置父元素的display:table-cell及vertical-align:middle来实现垂直居中 -->
<div class="box5">
<ul>
<li><a href="">第1项</a></li>
<li><a href="">第2项</a></li>
<li><a href="">第3项</a></li>
<li><a href="">第4项</a></li>
<li><a href="">第5项</a></li>
</ul>
</div>
<hr>
<h1>用五个色块制作一个十字(使用相对定位)</h1>
<div id="demo">
<div class="item1"></div>
<div class="item2"></div>
<div class="item3"></div>
<div class="item4"></div>
<div class="item5"></div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例