Troubleshooting issues with CSS absolute positioning

I'm having trouble getting my icons to align in the center of the screen and I can't figure out why it's not working CSS:

#Main{
    position: absolute;
    top: 50%;
    left: 50%;
}

HTML:

<!DOCTYPE html>
<html>
    <head>
    <link rel="stylesheet" type="text/css" href="index.css">
    </head>
    <body>
        <div id='Main'>
            <a href="https://me.rx14.co.uk/OwnCloud/" target="_self"><img alt="OwnCloud" src="https://me.rx14.co.uk/img/owncloud.png" style="width: 250px; height: 250px;" /></a>&nbsp;
            <a href="http://me.rx14.co.uk:8080/"><img alt="" src="https://me.rx14.co.uk/img/jenkins.png" style="width: 250px; height: 250px;" /></a>&nbsp;
            <a href="https://me.rx14.co.uk/solder/"><img alt="Solder" src="https://me.rx14.co.uk/img/solder.png" style="width: 250px; height: 250px;" /></a><br />
            <a href="https://me.rx14.co.uk/wx/"><img alt="" src="https://me.rx14.co.uk/img/wx.png" style="width: 250px; height: 250px;" /></a>&nbsp;
            <a href="https://me.rx14.co.uk/munin/"><img alt="" src="https://me.rx14.co.uk/img/munin.png" style="width: 250px; height: 250px;" /></a>&nbsp;
            <a href="https://me.rx14.co.uk/munin-live/"><img alt="" src="https://me.rx14.co.uk/img/munin_live.png" style="width: 250px; height: 250px;" /></a>
        </div>
    </body>
</html>

Result:

htmlcss

Answer №1

If you want to center the element, consider applying the following CSS:

margin-left:-[ELEMENT_WIDTH/2]px

and

margin-top:-[ELEMENT_HEIGHT/2]px

In this scenario (taking into account the dimensions of the images), you can use the following code:

#Main { position:absolute; top:50%; left:50%; margin:-375px 0 0 -375px; }

(assuming there are no additional margins or differences in width and height)

Alternatively, you could apply this code:

#Main { position:absolute; top:50%; left:50%; margin:-255px 0 0 -383px; }

(as suggested by EJanuszewski for your particular case)

Answer №2

To achieve this effect, negative margins are required as Kevin mentioned. Take a look at the example below for clarification.

If your #main div has a width of 766, dividing that by 2 equals 383, which will be your negative margin-left. For a height of 510, divide by 2 to get 255, serving as the negative margin-top.

Check out the example here: http://jsfiddle.net/EPs2L/

Here's the HTML code:

<div id='Main'>
    <a href="https://me.rx14.co.uk/OwnCloud/" target="_self"><img alt="OwnCloud" src="https://me.rx14.co.uk/img/owncloud.png" style="width: 250px; height: 250px;" /></a>&nbsp;
    <a href="http://me.rx14.co.uk:8080/"><img alt="" src="https://me.rx14.co.uk/img/jenkins.png" style="width: 250px; height: 250px;" /></a>&nbsp;
    <a href="https://me.rx14.co.uk/solder/"><img alt="Solder" src="https://me.rx14.co.uk/img/solder.png" style="width: 250px; height: 250px;" /></a><br />
    <a href="https://me.rx14.co.uk/wx/"><img alt="" src="https://me.rx14.co.uk/img/wx.png" style="width: 250px; height: 250px;" /></a>&nbsp;
    <a href="https://me.rx14.co.uk/munin/"><img alt="" src="https://me.rx14.co.uk/img/munin.png" style="width: 250px; height: 250px;" /></a>&nbsp;
    <a href="https://me.rx14.co.uk/munin-live/"><img alt="" src="https://me.rx14.co.uk/img/munin_live.png" style="width: 250px; height: 250px;" /></a>
</div>

And here's the corresponding CSS:

#Main{
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left:-383px;
    margin-top:-255px;
}

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