General DIV CSS three-column layout_html/css_WEB-ITnose
The general three-column approach is as shown in the figure below. My approach will have several DIV frames: Top, Container, Left, Content, Right, and Footer, which are the DIVs that usually exist.
====================
CSS source code
====== ==============
body{
margin:0; padding:0px} (If you want to center it and it works properly in Firefox, you need to change it to margin: 0px auto ;)
#DivTop {
width:1000px;
} (or set percentage)
#DivContainer {} (You don’t need to set width, it will default if there is no setting is 100%)
#DivLeft {
width:200px; float:left; }
#DivRight {
width:200px; float:right;}
#DivContent {
margin-left:200px;margin-right:200px;}
#DivFooter {
clear:both;}
========== ===========
HTML source code
====================
;div id="DivRight">The right side is square
====================
The arrangement of the above HTML is The key is that the middle Container contains the content of three DIVs: left, middle and right. The order of the left, middle and right source codes in the main body HTML is left, right, followed by Content
This is Because we have set up float:left(right) on the left Div and right Div, IE and Firefox browsers will first determine the left and right positions, and then the final middle content will come in, because we have set up margin -left :200px;margin-right:200px;, thus leaving the left and right block widths free.
Finally, you must set the clear:both; attribute in DivFooter to clear the float attribute so that the footer can be correctly displayed at the bottom. If you do not set this attribute, hehe ...Footer will float up for you, very disobedient :P
In addition, the height set by Firefox for the entire CSS scene will affect the footer at the bottom, as well as the judgment of padding and margin. IE and Firefox is very different, so you have to be careful with the settings. You will encounter this when you repeatedly design more complex layouts, but knowing this makes it easier to handle. It is nothing more than an arithmetic problem of addition, subtraction and subtraction.
Also, Firefox does not accept the CSS setting of text-align: center;, so the traditional
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