значения свойства:
* {
margin
:
0
;
padding
}
.main {
height
600px
width
900px
position
absolute
top
50%
left
margin-top
-300px
margin-left
-450px
.wrapper {
33.3%
100%
float
#div
1
, #div
2
3
{
200px
relative
-100px
background-color
#C0C0C0
border-left
5px
solid
#F00
* { margin: 0; padding: 0; } .main { height: 600px; width: 900px; position: absolute; top: 50%; left: 50%; margin-top: -300px; margin-left: -450px; } .wrapper { width: 33.3%; height: 100%; float: left; } #div1, #div2, #div3 { height: 200px; width: 200px; float: left; position: relative; top: 50%; left: 50%; margin-top: -100px; margin-left: -100px; background-color: #C0C0C0; } #div1 { border-left: 5px solid #F00; }
<!DOCTYPE html>
<
html
>
head
meta
charset
=
"utf-8"
/>
title
>New Page</
link
href
"css/style.css"
rel
"stylesheet"
script
type
"text/javascript"
src
"https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"
></
</
body
div
class
"main"
"wrapper"
id
"div1"
"div2"
"div3"
/*JavaScript*/
document.getElementById("div2").style.borderLeft = "5px solid #0F0";
/*jQuery*/
$(document).ready(function () {
$("#div3").css({ "border-left": "5px solid #00F" });
});