javascript - How to dynicamlly center the center of a div based on screen size - Stack Overflow

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I really thought this would be simple but i'm losing my mind! I just simple want to center a div in the div of the screen. But not that top left of the div to the center of the screen but the center of the div in the center.

Here is my div css

.box
{
    padding-top:20px;
    padding-left:5px;
    background-color: #ffffff;
    background-color: rgba(221,221,221,0.5);
    border: 1px solid black;
    border-radius: 25px;
    filter: alpha(opacity=90);
    height: 125px;
    width: 250px;
    z-index: 1;
}

<form id="form1" runat="server">
<div id="box"><div>
</form>

Thanks! I couldnt figure out how to get the html to side in a code block. This is center horizontally and vertically.

I really thought this would be simple but i'm losing my mind! I just simple want to center a div in the div of the screen. But not that top left of the div to the center of the screen but the center of the div in the center.

Here is my div css

.box
{
    padding-top:20px;
    padding-left:5px;
    background-color: #ffffff;
    background-color: rgba(221,221,221,0.5);
    border: 1px solid black;
    border-radius: 25px;
    filter: alpha(opacity=90);
    height: 125px;
    width: 250px;
    z-index: 1;
}

<form id="form1" runat="server">
<div id="box"><div>
</form>

Thanks! I couldnt figure out how to get the html to side in a code block. This is center horizontally and vertically.

• javascript
• css

Share Improve this question Follow edited Sep 24, 2013 at 15:48 asked Sep 24, 2013 at 15:38 user222427user222427 1

• 1 margin:auto will get it centered horizontally – Andrew Hall Commented Sep 24, 2013 at 15:40

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 4

Use position:absolute if you need it centred both horizontally and vertically:

#box {
    position:absolute; 
    top:0; left:0; right:0; bottom:0; 
    margin:auto;
    /* etc */
}

http://jsfiddle/wcFMw/

To center horizontally:

margin:auto;

To center vertically:

position: absolute;
top: 0; left: 0; bottom: 0; right: 0;

You could also use position: fixed to make the div centered even when scrolling the page.

Also note that you'll have to use # instead of . to select by id. . is the CSS selector used for class.

JsFiddle

margin:0 auto;

Add this property to your css class.

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