How to make the center of CSS layout of Web page

css| Page | question 1, Div Center
body {text-align:center;}
div {margin-right:auto; margin-left:auto;}
Description
For IE, the parent element defines "text-align:center;" It's okay.

For other browsers, such as FF, only this is not centered, you need to define "Margin-right:auto" in the child elements; Margin-left:auto; ".

2, the background center
Body {background:url (#) #fff No-repeat Center;
Description: Center in the argument is the definition of the background position.

3, the text vertically centered
div {vertical-align:middle;line-height:? px;}
Description
Vertical-align:middle indicates that the row is centered vertically, we adjust the line spacing to be as high as the entire Div, and the text is centered vertically.