

因此我写了这篇文章,希望能把他变得容易点。
你可以让他相对父级块级元素居中对齐
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.center-children {
text-align: center;
}
|
你可以通过设置margin-left和margin-right为auto让它居中(同时还要设置width,否则它就会承满整个容器,无法看出居中效果),如。
| 1 2 3 |
.center-me {
margin: 0 auto;
}
|
如果你有很匀块级元素需要水平居中成一行,你最好使用一个不同的display类型。这是一个使用inline-block和flex的例子。
在线示例: http://jsfiddle.net/ourjs/0b6b7wt8/
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<main class="inline-block-center">
<div>
I'm an element that is block-like with my siblings and we're centered in a row.
div>
<div>
I'm an element that is block-like with my siblings and we're centered in a row. I have more content in me than my siblings do.
div>
<div>
I'm an element that is block-like with my siblings and we're centered in a row.
div>
main>
<main class="flex-center">
<div>
I'm an element that is block-like with my siblings and we're centered in a row.
div>
<div>
I'm an element that is block-like with my siblings and we're centered in a row. I have more content in me than my siblings do.
div>
<div>
I'm an element that is block-like with my siblings and we're centered in a row.
div>
main>
|
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body {
background: #f06d06;
font-size: 80%;
}
main {
background: white;
margin: 20px 0;
padding: 10px;
}
main div {
background: black;
color: white;
padding: 15px;
max-width: 125px;
margin: 5px;
}
.inline-block-center {
text-align: center;
}
.inline-block-center div {
display: inline-block;
text-align: left;
}
.flex-center {
display: flex;
justify-content: center;
}
|
内联元素(inline or inline-*)居中,像文本和链接那样的?
有时侯元素可以表现像垂直居中,只是因为它们有相等的上下padding
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.link {
padding-top: 30px;
padding-bottom: 30px;
}
|
如果padding因为某些原因不能用,而且文本不会换行的情况下,你可以使用line-height,让其与height相等去对齐文本。
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.center-text-trick {
height: 100px;
line-height: 100px;
white-space: nowrap;
}
|
上下等padding的方式也可以让多行居中,但是如果这方法没用,你可以让这些文字的容器按table cell模式显示,然后设置文字的vertical-align属性对齐,就像talbe那样
在线演示: http://jsfiddle.net/ourjs/0fn2u4rc/
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<table>
<tr>
<td>
I'm vertically centered multiple lines of text in a real table cell.
td>
tr>
table>
<div class="center-table">
<p>I'm vertically centered multiple lines of text in a CSS-created table layout.p>
div>
|
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body {
background: #f06d06;
font-size: 80%;
}
table {
background: white;
width: 240px;
border-collapse: separate;
margin: 20px;
height: 250px;
}
table td {
background: black;
color: white;
padding: 20px;
border: 10px solid white;
/* default is vertical-align: middle; */
}
.center-table {
display: table;
height: 250px;
background: white;
width: 240px;
margin: 20px;
}
.center-table p {
display: table-cell;
margin: 0;
background: black;
color: white;
padding: 20px;
border: 10px solid white;
vertical-align: middle;
}
|
你知道元素的高度吗?
出于很多方面的原因,不知道网页布局的高度是相当普遍的。
但是如果你的布局有一个固定高度,你就可以这样垂直居中:
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.parent {
position: relative;
}
.child {
position: absolute;
top: 50%;
height: 100px;
margin-top: -50px; /* 如果没有使用: border-box; 的盒子模型则需要设置这个 */
}
|
元素的高度是未知的
尽管未知,但你仍有可能向上推移50%的宽度
在线演示: http://jsfiddle.net/ourjs/9sLf7p56/
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.parent {
position: relative;
}
.child {
position: absolute;
top: 50%;
transform: translateY(-50%);
}
|
你可以使用flexbox吗?
这并不奇怪,使用flexbox会容易非常多
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<main>
<div>
I'm a block-level element with an unknown height, centered vertically within my parent.
div>
main>
|
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body {
background: #f06d06;
font-size: 80%;
}
main {
background: white;
height: 300px;
width: 200px;
padding: 20px;
margin: 20px;
display: flex;
flex-direction: column;
justify-content: center;
resize: vertical;
overflow: auto;
}
main div {
background: black;
color: white;
padding: 20px;
resize: vertical;
overflow: auto;
}
|
如果元素的宽度和高度是固定的,你需要先绝对居中,然后上移和左移50%的宽度即可,这种方案有极好的跨浏览器支持。
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.parent {
position: relative;
}
.child {
width: 300px;
height: 100px;
padding: 20px;
position: absolute;
top: 50%;
left: 50%;
margin: -70px 0 0 -170px;
}
|
如果你不知道高度和宽度(可变的),你可以使用transofrm属性在两个方向都平移负50%
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.parent {
position: relative;
}
.child {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
|
原文地址: css-tricks.com
