Aligning an image at the vertical center of a specific-sized element: adjusting the position at the top

I am trying to align thumbnail images in fixed square containers, both horizontally and vertically centered. While using CSS properties like height, line-height, and vertical-align, I almost have it working but there is a small top offset of 2px that I can't seem to eliminate. I'm curious about the reason behind this offset.

To address this issue, I could apply a negative top margin to the image, although I prefer to find a solution that doesn't rely on this workaround (as it may cause compatibility problems across different browsers). It's surprising that I need a -4px top margin to counteract the initial 2px offset.

Can anyone provide some insights or suggestions?

You can view the code example here: http://jsfiddle.net/GlauberRocha/N6Rme/

css

Answer №1

Hello! It seems like you're interested in achieving this particular effect

To achieve the desired look, simply remove the margin -minus and add a border to both the ul and li elements as shown below:

For a live demonstration, visit http://jsfiddle.net/N6Rme/5/

Answer №2

After carefully reviewing your markup, no bugs were found. It seems like the issue may be related to typography and CSS. Therefore, I recommend trying a new technique for vertical centering that will definitely help.

Check out the live demo on dabblet.com

To implement this technique, add the following to your CSS:

li {
    /* … */
    position: relative;
}

li img {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
}

The key concept in this demo is adjusting the positioning of elements within the flow. By setting margin-top: auto to zero for normally flowing elements, we achieve proper alignment vertically. This same principle can be applied to absolutely positioned elements by utilizing top and bottom properties (excluding compatibility with IE7).

This technique will effectively center images of any size.

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