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POVertically centered fluid layout with floats but can't add visible margins
 

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  1. POVertically centered fluid layout with floats but can't add visible margins
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    <p>I've been battling with this for a while now, always seeming to get somewhere with one approach, only to then find a problem lurking when I think I'm almost done.</p> <p>In a nutshell, I'm trying to vertically center content in a div that has a height equal to a percentage of the window height. If the content is taller than that of the containing div, then only some portions of the content should scroll.</p> <p>Please see <a href="http://fiddle.jshell.net/verism/G74F9/show/" rel="nofollow">this fiddle result</a> to get an idea of what I'm trying to do; (actual fiddle is <a href="http://jsfiddle.net/verism/G74F9/" rel="nofollow">here</a>).</p> <p>The final (I hope) hurdle is to somehow add a small, fixed amount of space (say, 30px) between the main text and the red "button", when there is enough content to force scrolling. However, everything I've tried - i.e. various combinations of margins and/or padding - just doesn't work. Can somebody please help?</p> <hr> <p><strong>Mandatory Code</strong></p> <p>HTML:</p> <pre><code>&lt;div id="main"&gt; &lt;div id="box"&gt; &lt;div id="content"&gt; &lt;h1 id="heading"&gt;HEADING&lt;/h1&gt; &lt;div id="left"&gt; &lt;div id="leftContents"&gt; &lt;p&gt;Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque eget diam in mi facilisis condimentum. Nullam at arcu erat. Nullam elit libero, sodales sit amet pellentesque et.&lt;/p&gt; &lt;/div&gt; &lt;/div&gt; &lt;div id="button"&gt;&lt;/div&gt; &lt;/div&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>CSS:</p> <pre><code>*{ padding:0; margin:0; } #main { position:absolute; top:0; left:0; right:0; bottom:0; background:lightblue; text-align:center; font-family:arial; } #box{ position:absolute; top:15%; bottom:15%; background:white; left:50%; } #content{ position:absolute; width:100%; top:50%; background:lightgrey; } #left{ float:left; width:50%; overflow:auto; background:lightyellow; margin-bottom:30px; } #leftContents{ /*clear:left;*/ } #button{ height:30px; background:red; position:absolute; bottom:0; left:25%; right:25%; } </code></pre> <p>jQuery:</p> <pre><code>function alignContent() { // Position containing box $box = $('#box'); $box.css({ 'width': $box.height() + 'px', 'margin-left': '-' + $box.height() / 2 + 'px' }); // Size &amp; position content area $content = $('#content'); $content.css({ 'max-height': $box.height() - 72 + 'px', 'margin-top': '-' + ($content.outerHeight() / 2) + 'px' }); // Left panel sizing $left = $('#left'); $max = ($box.height() - 72 - 30 - $('#heading').outerHeight()); $left.css({ 'max-height': $max }); } alignContent(); // Update when resized $(window).resize(function () { alignContent(); }); $(window).load(function () { alignContent(); }); </code></pre> <p>Thanks!</p>
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