Summary of CSS vertical centering methods_html/css_WEB-ITnose

1. Treat the container as a table unit

<div class="middle-demo1">    <button>按钮</button></div>

.middle-demo1{ display: table-cell; height: 100px; //可以动态改变高度，这里只是演示 vertical-align: middle; border: 1px solid #666; }

Browser support:
http://caniuse.com /#search=table-cell

2. Fixed-height elements should be vertically centered

<div class="middle-demo2">    <div class="g-box"></div></div>

.middle-demo2{ position: relative; width: 200px; height: 200px; border: 1px solid #666; }.g-box{ position: absolute; top: 50%; width: 100px; height: 100px; margin-top: -50px; background-color: deepskyblue; }或者.g-box{ position: absolute; top: 50%; width: 100px; height: 100px; -webkit-transform: translateY(-50px); -moz-transform: translateY(-50px); -ms-transform: translateY(-50px); -o-transform: translateY(-50px); transform: translateY(-50px); background-color: deepskyblue; }

Note: should be vertically centered The element (g-box) must be of fixed height (except for js dynamic calculation settings).
Browser support for transform http://caniuse.com/#search=transform

3. Fixed-height elements are vertically centered

<div class="middle-demo3">    <div class="g-box2"></div>    <div class="g-box3"></div></div>

g-box3 is an element that needs to be vertically centered

.middel-demo3{ position: relative; width: 200px; height: 200px; border: 1px solid #666; }.g-box2{ height: 50%; margin-bottom: -50px; }.g-box3{ height: 100px; background-color: deepskyblue; }

Note: The element (g-box3) that needs to be vertically centered must be a fixed height.

4. Vertically centered elements with variable height

<div class="middle-demo4">    <div class="g-box4"></div></div>

.middle-demo4{ position: relative; width: 200px; height: 200px; border: 1px solid #666; }.g-box4{ position: absolute; top: 0; bottom: 0; margin-top: auto; margin-bottom: auto; width: 100px; height: 100px; background-color: deepskyblue; }

Explanation: Elements to be vertically centered (g-box4) can be The height is not fixed. The browser supports IE8 and other browsers have better support

5. Single-line text is vertically centered

<div class="middle-demo5">    <span>单行文本</span></div>

.middle-demo5{ height: 100px; line-height: 100px; border: 1px solid #666; }

Instructions : is invalid for internal block elements

6. The container has a fixed or variable height, and multi-line text is vertically centered

<div class="middle-demo6">    <p>单行文本</p>    <p>多行文本</p></div>

.middle-demo6{ display: table-cell; vertical-align: middle; height: 200px; //容器可以不定高，这里只是演示 border: 1px solid #666; }

7. Vertical-align implements vertical centering of inline elements

<div class="middle-demo7">    <span class="g-fix"></span>    <button class="g-box7">行内元素</button></div>

.middle-demo7{ position: relative; width: 200px; height: 200px; border: 1px solid #666; }.g-fix{ display: inline-block; width:0; height: 100%; vertical-align: middle; }

Instructions: Browser support http://caniuse.com/#search= inline-block