I have an issue with absolute and relative positioning.
Im trying to center a relative DIV that contains all absolute div. The problem I have is when I try to center my relative DIV, my absolute div "#mainForm" get shrink (height issue).
In the html below, if you remove the position and margin attribute on the "#main" class, you will see that the page layout is displayed correctly.
How can I center my relative div without affecting my absolute divs ?
** What im trying to achieve is to have only my #mainForm that is scrollable. My sideBar, mainHeader and mainFooter must be "fixed". Client requirements...
Thanks David
Here is my CSS and HTML.
<head>
<meta http-equiv="content-type" content="text/html;charset=iso-8859-1" />
<style>
html {
box-sizing: border-box;
}
body {
font-family: Helvetica,Arial,sans-serif;
font-size: 8pt;
}
*, *:before, *:after {
box-sizing: inherit;
}
#main {
position: relative; /* if I removed this, page is not centered but mainForm height is ok */
margin: 0 auto; /* if I removed this, page is not centered but mainForm height is ok */
width: 960px;
}
#sideBar {
position: absolute;
top:0;
bottom:0;
left:0;
width: 180px;
}
#mainContent {
position: absolute;
top:0;
bottom:0;
right:0;
left:180px; /* Width of #sideBar. */
width: 780px;
}
#mainHeader {
position: absolute;
top:0;
height:40px;
width:100%; /* Mandatory. With is 100% of parent div. */
border: 1px solid blue; /* For developing purpose */
}
#mainForm {
position: absolute;
overflow:auto;
top:40px;
bottom:40px;
width:100%; /* Mandatory. With is 100% of parent div. */
border: 1px solid yellow; /* For developing purpose */
}
#mainFooter {
position: absolute;
bottom:0;
height:40px;
text-align:right;
width:100%; /* Mandatory. With is 100% of parent div. */
}
#topSideBar {
position: absolute;
top:0;
left:0;
background-image: url("../images/pas/contactLogo.png");
background-repeat: no-repeat;
height:110px;
width:100%; /* Mandatory. With is 100% of parent div. */
}
#middleSideBar {
position: absolute;
top:110px;
height:200px;
width:100%; /* Mandatory. With is 100% of parent div. */
}
#bottomSideBar {
position: absolute;
bottom:0;
height:100px;
width:100%; /* Mandatory. With is 100% of parent div. */
}
/* clearfix */
.clearFixaa:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
</style>
</head>
<body>
<div id="main" class="clearFix">
<div id="sideBar" >
<div id="topSideBar">
<!-- Contact Logo css backgound. -->
</div>
<div id="middleSideBar">
middleSideBar
</div>
<div id="bottomSideBar">
bottomSideBar
</div>
</div>
<div id="mainContent">
<div id="mainHeader">
mainHeader
</div>
<div id="mainForm">
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
mainForm
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
mainForm
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
mainForm
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
mainForm
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
mainForm
<br/><br/><br/><br/><br/><br/><br/><br/><br/>
</div>
<div id="mainFooter">
mainFooter
</div>
</div>
</div>
</body>
I modified your css. This will do the work:
html {
box-sizing: border-box;
}
body {
font-family: Helvetica, Arial, sans-serif;
font-size: 8pt;
}
*, *:before, *:after {
box-sizing: inherit;
}
#main {
position: fixed;
/* if I removed this, page is not centered but mainForm height is ok */
margin: 0 auto;
/* if I removed this, page is not centered but mainForm height is ok */
width: 960px;
height: 960px;
left: 0;
right: 0;
}
#sideBar {
position: absolute;
top:0;
bottom:0;
left:0;
width: 180px;
border: 1px solid red;
/* For developing purpose */
}
#mainContent {
position: absolute;
top:0;
bottom:0;
right:0;
left:180px;
/* Width of #sideBar. */
width: 780px;
height: 100%;
}
#mainHeader {
position: absolute;
top:0;
height:40px;
width:100%;
/* Mandatory. With is 100% of parent div. */
border: 1px solid blue;
/* For developing purpose */
}
#mainForm {
position: absolute;
overflow:auto;
top:40px;
bottom:40px;
width:100%;
/* Mandatory. With is 100% of parent div. */
border: 1px solid yellow;
/* For developing purpose */
}
#mainFooter {
position: absolute;
bottom:0;
height:40px;
text-align:right;
width:100%;
/* Mandatory. With is 100% of parent div. */
}
#topSideBar {
position: absolute;
top:0;
left:0;
background-image: url("../images/pas/contactLogo.png");
background-repeat: no-repeat;
height:110px;
width:100%;
/* Mandatory. With is 100% of parent div. */
}
#middleSideBar {
position: absolute;
top:110px;
height:200px;
width:100%;
/* Mandatory. With is 100% of parent div. */
}
#bottomSideBar {
position: absolute;
bottom:0;
height:100px;
width:100%;
/* Mandatory. With is 100% of parent div. */
}
/* clearfix */
.clearFixaa:after {
content:".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
The trick was to fixed the #main div and position it with left:0 and right:0. I had a static height for the main div, feel free to remove it and add height where you need like for the sidebar.