html - CSS - Making a div consume all available space

Question

All,

I have a page which is suppose to take up only the available screen space in the browser.

I have a 'top bar' and a 'bottom bar', both of which are fixed positioned at the top and bottom of the page. I want to have a div which will consume (take up) the remaining of the space inbetween the two bars mentioned above.

Its crucial that the middle div is not overlapped by the top and bottom bars. Is this at all possible with CSS or do I need to make use of js.

Also, if I do go with js, considering the browser loads up the CSS first before the js code, how is the above work out using js for centre positioning?

Many thanks,

Answer 1

You can use relative and absolute positions. Here an example:

css

   html,body,#wrapper {
        height:100%;
        margin:0;
        padding:0;
    }
    #wrapper {
        position:relative;
    }

    #top, #middle, #bottom {
        position:absolute;
    }

    #top {
        height:50px;
        width:100%;
        background:grey;
    }
    #middle {
        top:50px;
        bottom:50px;
        width:100%;
        background:black;
    }
    #bottom {
        bottom:0;
        height:50px;
        width:100%;
        background:grey;
    }

html

<div id="wrapper">
    <div id="top"></div>
    <div id="middle"></div>
    <div id="bottom"></div>
</div>

Demo: http://jsfiddle.net/jz4rb/4