"Understanding the impact of CSS margin on elements nested within a container with position

I find myself in a tricky situation right now. To make things easier, I'll show you what I've created and highlight the issue, rather than explaining it all.

I've been on the hunt for a solution for quite some time, to no avail.

If you visit http://jsfiddle.net/bd3Ms/, you'll come across three boxes with an h1 tag and an image inside. I've used CSS to clip the image (which is necessary), but I'm struggling to center it within the box. I suspect it's due to the absolute positioning of the img element.

Here's the code:

<html>
<head>
    <link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.0/css/bootstrap-combined.min.css" rel="stylesheet">

    <style type="text/css">
        .photo-div {
            overflow:auto;
            height:250px;
            border: 1px solid #000;
        }

        .photo-div-content {
            width:100%;
            margin:0 auto;
        }

        img.clipped {
            position:absolute;
            clip:rect(0px,200px,200px,0px);
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="row">
            <div id="div-1" class="photo-div span4">
                <div class="photo-div-content">
                    <h1>Logitech Mouse</h1>
                    <img class="clipped" src="https://www.google.nl/images/srpr/logo3w.png">
                </div>
            </div>
                <div id="div-2" class="photo-div span4">
                <div class="photo-div-content">
                    <h1>Logitech Mouse</h1>
                    <img class="clipped" src="https://www.google.nl/images/srpr/logo3w.png">
                </div>
            </div>
            <div id="div-3" class="photo-div span4">
                <div class="photo-div-content">
                    <h1>Logitech Mouse</h1>
                    <img class="clipped" src="https://www.google.nl/images/srpr/logo3w.png">
                </div>
            </div>
        </div>
    </div>
</body>

I'm utilizing Twitter Bootstrap for a fully responsive website, so simply adding a margin-left won't cut it..

I hope I've clearly outlined the issue.

Thank you in advance for your assistance!

Answer №2

If I am interpreting your query correctly, you are looking to center both the text and the clipped image. Take a look at this solution for assistance: http://jsfiddle.net/panchroma/7Lq6B/

The key point here is that I have enclosed the images in a centered div that matches the dimensions of your clipping.

CSS

.img-wrap{ /* dimensions should match clipping size */
width:200px;
height:200px;
margin:0 auto;
}

HTML

<div id="div-2" class="photo-div span4">
<div class="photo-div-content">
<h1>Logitech Mouse</h1>
<div class="img-wrap">
<img class="clipped" src="https://www.google.nl/images/srpr/logo3w.png"></div>
</div>
</div>

Best of luck!

Answer №3

When the image is set to absolute positioning, there are several creative options to experiment with. Give this a try:

img.clipped {
    position: absolute;
    left: 50%;
    margin-left: -25%;
    clip:rect(0px,200px,200px,0px);
}

Although the code may not be the most aesthetically pleasing, it does center the image within the parent element.

Answer №4

The method I employed is similar to the one I usually utilize for CSS sprites.

.image-div-content{
    background: 'url('IMAGE URL') repeat scroll -0px -0px transparent');
    height: 200px;
    width: 200px;
    margin: 0 auto;
}

At this moment, I believe that this is the most effective approach to achieve my objective: utilizing CSS to display a portion of an image in the center of a div.

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