css弹性布局笔记一(垂直居中、水平居中、居中)(display:flex)
CSS弹性布局,需要一个容器,容器中至少包含一个以上的元素flex布局,子元素自动换行,取消行间距,相邻子元素的border重叠
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CSS弹性布局,需要一个容器,容器中至少包含一个以上的元素,以下代码包含子元素垂直居中、水平居中、居中三种情况
<html>
<head>
<style type="text/css">
div {
height: 200px;
width:200px;
background-color: blue;
color: white;
margin: 10px;
}
div > p:first-child {
background-color: green;
}
div > p:last-child {
background-color: red;
}
div > p {
padding: 5px;
margin:5px;
width: fit-content;
}
.flex-middle {
display: flex;
justify-content: center;
align-items: center;
}
.flex-middle {
display: flex;
justify-content: center;
align-items: center;
}
.flex-middle {
display: flex;
justify-content: center;
align-items: center;
}
.flex-middle {
display: flex;
justify-content: center;
align-items: center;
flex-direction: column; /* 子元素垂直分布 */
}
.flex-horizontal-middle {
display: flex;
align-items: center;
flex-direction: column;
}
.flex-vertical-middle {
display: flex;
justify-content: center;
flex-direction: column; /* 子元素垂直分布 */
}
.flex-horizontal {
display: flex;
}
.flex-horizontal > p {
flex: 1;
height:fit-content;
justify-content:space-around;
margin: 0 2px 0 2px;
}
.flex-horizontal > p:first-child {
margin-left: 0px;
margin-right: 2px;
}
.flex-horizontal > p:last-child {
margin-right: 0px;
margin-left: 2px;
}
.div0 {
background: green;
width: 820px;
height: fit-content;
padding: 10px;
display:flex;
flex-flow: wrap; /* 容器中的子元素会自动换行,从左往右均匀排列 */
align-content: flex-start; /* 子元素在容器顶部排列,会解决换行时子元素行间距变大的原因*/
}
.div-1{
width: calc(25% - 22px);
background: blue;
color: white;
padding: 10px;
border: 2px solid red;
height:100px;
margin-left: 0px;
margin-bottom: 0px;
margin-top: -2px;
margin-right: -2px;
}
</style>
</head>
<body>
<p>垂直居中:</p>
<div class="flex-vertical-middle">
<p>内容垂直居中1</p>
<p>内容垂直居中2</p>
</div>
<p>水平居中:</p>
<div class="flex-horizontal-middle">
<p>内容水平居中1</p>
<p>内容水平居中2</p>
</div>
<p>居中:</p>
<div class="flex-middle">
<p>内容居中1</p>
<p>内容居中2</p>
</div>
<p>水平平均分布:<p/>
<div class="flex-horizontal">
<p>内容1</p>
<p>内容2</p>
<p>内容3</p>
<p>内容4</p>
</div>
<p>flex自动换行,相邻子元素border去重叠<p/>
<div class='div0'>
<div class="div-1">A</div>
<div class="div-1">B</div>
<div class="div-1">C</div>
<div class="div-1">D</div>
<div class="div-1">E</div>
<div class="div-1">F</div>
<div class="div-1">G</div>
<div class="div-1">H</div>
<div class="div-1">I</div>
</div>
</bo![在这里插入图片描述](https://img-blog.csdnimg.cn/e24019fd9ca04aba8e99a89b309d32e1.png#pic_center)
dy>
</html>
代码运行结果:
在这里插入代码片
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