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CSS - Removing Padding or Margin in Portion of Dreamweaver CS3 1 Col Elastic Template

I am trying to remove (as in collapse, not paint over) the space represented by the blue area in the attached html template but can't figure out what is controlling it (not sure if it is a padding or margin declaration somewhere which is missing or specifically causing it).


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style type="text/css">
<!--
body {
	font: 100% Verdana, Arial, Helvetica, sans-serif;
	background: #000000;
	margin: 0; /* it's good practice to zero the margin and padding of the body element to account for differing browser defaults */
	padding: 0;
	text-align: center; /* this centers the container in IE 5* browsers. The text is then set to the left aligned default in the #container selector */
	color: #FFFFFF;
}
 
/* Tips for Elastic layouts 
1. Since the elastic layouts overall sizing is based on the user's default fonts size, they are more unpredictable. Used correctly, they are also more accessible for those that need larger fonts size since the line length remains proportionate.
2. Sizing of divs in this layout are based on the 100% font size in the body element. If you decrease the text size overall by using a font-size: 80% on the body element or the #container, remember that the entire layout will downsize proportionately. You may want to increase the widths of the various divs to compensate for this.
3. If font sizing is changed in differing amounts on each div instead of on the overall design (ie: #sidebar1 is given a 70% font size and #mainContent is given an 85% font size), this will proportionately change each of the divs overall size. You may want to adjust based on your final font sizing.
*/
.oneColElsCtrHdr #container {
	width: 57em;
	margin: 0 auto; /* the auto margins (in conjunction with a width) center the page */
	padding: 0px;
	border: 1px solid #000000;
	text-align: left; /* this overrides the text-align: center on the body element. */
	background-color: #0000FF;
}
.oneColElsCtrHdr #topnavbar {
	padding: 0 10px;
	text-align: center;
	background-color: #FF6600;
} 
.oneColElsCtrHdr #header {
/*	padding: 0 10px 0 20px;*/  /* this padding matches the left alignment of the elements in the divs that appear beneath it. If an image is used in the #header instead of text, you may want to remove the padding. */
	text-align: center;
	background-color: #FF0000;
} 
.oneColElsCtrHdr #header h1 {
	margin: 0; /* zeroing the margin of the last element in the #header div will avoid margin collapse - an unexplainable space between divs. If the div has a border around it, this is not necessary as that also avoids the margin collapse */
	padding: 10px 0; /* using padding instead of margin will allow you to keep the element away from the edges of the div */
}
.oneColElsCtrHdr #mainContent {
/*	padding: 0 20px;*/
/*	padding: 20px 0;*/
	background-color: #00FF00;
}
.oneColElsCtrHdr #footer {
	padding: 0 10px;
	text-align: center;
	background-color: #FF00FF;
} 
.oneColElsCtrHdr #footer p {
	margin: 0; /* zeroing the margins of the first element in the footer will avoid the possibility of margin collapse - a space between divs */
	padding: 10px 0; /* padding on this element will create space, just as the the margin would have, without the margin collapse issue */
}
-->
</style>
</head>
 
<body class="oneColElsCtrHdr">
 
<div id="container">
  <div id="header">
    <h1>Header</h1>
  <!-- end #header --></div>
  <div id="topnavbar">
  <p>topnavbar</p>
  <!-- end #topnavbar --></div>
  <div id="mainContent">
    <h1> Main Content </h1>
    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Praesent aliquam,  justo convallis luctus rutrum, erat nulla fermentum diam, at nonummy quam  ante ac quam. Maecenas urna purus, fermentum id, molestie in, commodo  porttitor, felis. Nam blandit quam ut lacus. Quisque ornare risus quis  ligula. Phasellus tristique purus a augue condimentum adipiscing. Aenean  sagittis. Etiam leo pede, rhoncus venenatis, tristique in, vulputate at,  odio. Donec et ipsum et sapien vehicula nonummy. Suspendisse potenti. Fusce  varius urna id quam. Sed neque mi, varius eget, tincidunt nec, suscipit id,  libero. In eget purus. Vestibulum ut nisl. Donec eu mi sed turpis feugiat  feugiat. Integer turpis arcu, pellentesque eget, cursus et, fermentum ut,  sapien. Fusce metus mi, eleifend sollicitudin, molestie id, varius et, nibh.  Donec nec libero.</p>
    <h2>H2 level heading </h2>
    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Praesent aliquam,  justo convallis luctus rutrum, erat nulla fermentum diam, at nonummy quam  ante ac quam. Maecenas urna purus, fermentum id, molestie in, commodo  porttitor, felis. Nam blandit quam ut lacus. Quisque ornare risus quis  ligula. Phasellus tristique purus a augue condimentum adipiscing. Aenean  sagittis. Etiam leo pede, rhoncus venenatis, tristique in, vulputate at, odio.</p>
	<!-- end #mainContent --></div>
  <div id="footer">
    <p>Footer</p>
  <!-- end #footer --></div>
<!-- end #container --></div>
</body>
</html>

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CSS

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Last Comment
glumlun

8/22/2022 - Mon
SOLUTION
udoobu

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SOLUTION
udoobu

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ASKER
qeng

Udoobu,
Thx for the prompt reply.
Is there not another way to implement this (for example some class or id selector) which would override the default <p> tag margins to whatever divs I applied it to.  Or perhaps applying a negative margin top and bottom margin to the divs where I want to eliminate the default margin (I tested the negative margin idea just now and it does work ... I'm just not sure if I'm going to run into other problems later as a result of it).
Otherwise, as you suggest, the paragraphs in my entire site will be running into each other and will require hand coding <br/> tags each time I want a line break between a paragrah.
Mike
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