Horizontal centering:
Inline elements: text-align:center; Centered display relative to the parent
Block-level elements: margin:0 auto; but width is required at the same time, otherwise it cannot See the effect
Multiple block-level elements are centered: I would like to discuss display:inline-block; and display:flex;
Method 1: Set text-align:center; on the parent; on the element Setting: display: inline-block; At the same time, in order to make the text display to the left, set text-align: left; the display in the browser is that the child element height is adaptive and the bottom is aligned.
Method 2: Set display:center;justify-content:center on the child element; the height of the child element is consistent, which is the same as the height of the element with the most content.
The two methods are compatible with Google, Firefox, and 360, but the second method is not compatible with IE10, and previous IE versions are also incompatible. Of course, we also have to deal with the problem of separation from the layer due to floating, and the parent background color cannot be added.
1 <main class="inline-block-center"> 2 <div> 3 I'm an element that is block-like with my siblings and we're centered in a row. 4 </div> 5 <div> 6 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. 7 </div> 8 <div> 9 I'm an element that is block-like with my siblings and we're centered in a row.10 </div>11 </main>
1 <main class="flex-center"> 2 <div> 3 I'm an element that is block-like with my siblings and we're centered in a row. 4 </div> 5 <div> 6 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. 7 </div> 8 <div> 9 I'm an element that is block-like with my siblings and we're centered in a row.10 </div>11 </main>
1 body { 2 background: #f06d06; 3 font-size: 80%; 4 } 5 main { 6 background: white; 7 margin: 20px 0; 8 padding: 10px; 9 }10 main div {11 background: black;12 color: white;13 padding: 15px;14 max-width: 125px;15 margin: 5px;16 }17 .inline-block-center {18 text-align: center;19 }20 .inline-block-center div {21 display: inline-block;22 text-align: left;23 }24 .flex-center {25 display: flex;26 justify-content: center;27 }
Vertically centered:
Method 1: Set the values of padding-top and padding-bottom to be equal
Method 2: Set the values of height and line-height to be equal
Method 3: Fixed height can be handled in a way position:absolute; top:50%;height:100px;margin-top:-50px;If the height is not fixed, you can also use js to dynamically obtain the height.
There are also some properties of CSS3, which are not described in consideration of compatibility issues.

在css中,可用list-style-type属性来去掉ul的圆点标记,语法为“ul{list-style-type:none}”;list-style-type属性可设置列表项标记的类型,当值为“none”可不定义标记,也可去除已有标记。

区别是:css是层叠样式表单,是将样式信息与网页内容分离的一种标记语言,主要用来设计网页的样式,还可以对网页各元素进行格式化;xml是可扩展标记语言,是一种数据存储语言,用于使用简单的标记描述数据,将文档分成许多部件并对这些部件加以标识。

在css中,可以利用cursor属性实现鼠标隐藏效果,该属性用于定义鼠标指针放在一个元素边界范围内时所用的光标形状,当属性值设置为none时,就可以实现鼠标隐藏效果,语法为“元素{cursor:none}”。

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}”。

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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