Method: 1. Use the "display:table-cell;vertical-align:middle;" style; 2. Use flex layout; 3. Use absolute positioning and negative margins; 4. Use absolute positioning and transform Attributes; 5. Use absolute positioning and attributes such as top and left.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
Vertical centering is one of the very common effects in layout. In order to achieve good compatibility, the method of achieving vertical centering on the PC side is generally through absolute positioning, table-cell, negative margins and other methods. With CSS3, vertical centering for mobile terminals is more diverse.
Method 1: table-cell
html structure:
<div class="box box1"> <span>垂直居中</span> </div>
css:
.box1{ display: table-cell; vertical-align: middle; text-align: center; }
Method 2: display:flex
.box2{ display: flex; justify-content:center; align-items:Center; }
Method 3: Absolute positioning and negative margins
.box3{position:relative;} .box3 span{ position: absolute; width:100px; height: 50px; top:50%; left:50%; margin-left:-50px; margin-top:-25px; text-align: center; }
Method 4: Absolute positioning and 0
.box4 span{ width: 50%; height: 50%; background: #000; overflow: auto; margin: auto; position: absolute; top: 0; left: 0; bottom: 0; right: 0; }
This method is somewhat similar to the above, but here, centering is achieved by setting margin:auto and top, left, right, and bottom to 0. It's amazing. However, you need to determine the height of the internal elements here. You can use percentages, which is more suitable for mobile terminals.
Method 5: translate
.box6 span{ position: absolute; top:50%; left:50%; width:100%; transform:translate(-50%,-50%); text-align: center; }
This is actually a transformation of method 3, and the shift is achieved through translate.
Method 6: display:inline-block
.box7{ text-align:center; font-size:0; } .box7 span{ vertical-align:middle; display:inline-block; font-size:16px; } .box7:after{ content:''; width:0; height:100%; display:inline-block; vertical-align:middle; }
This method is really clever...use: after to occupy the space.
(Learning video sharing: css video tutorial)
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转换方法:1、给英文元素添加“text-transform: uppercase;”样式,可将所有的英文字母都变成大写;2、给英文元素添加“text-transform:capitalize;”样式,可将英文文本中每个单词的首字母变为大写。

在css中,rtl是“right-to-left”的缩写,是从右往左的意思,指的是内联内容从右往左依次排布,是direction属性的一个属性值;该属性规定了文本的方向和书写方向,语法为“元素{direction:rtl}”。

在css中,可以利用“font-style”属性设置i元素不是斜体样式,该属性用于指定文本的字体样式,当属性值设置为“normal”时,会显示元素的标准字体样式,语法为“i元素{font-style:normal}”。

在css3中,可以用“transform-origin”属性设置rotate的旋转中心点,该属性可更改转换元素的位置,第一个参数设置x轴的旋转位置,第二个参数设置y轴旋转位置,语法为“transform-origin:x轴位置 y轴位置”。


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