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html - CSS height not working if body has min-height

I don't get my first child in the body to 100% height, if the body has min-height specified.

<html>
    <head>
        <style>
            html {
                height:100%;
            }
            body {
                min-height:100%;
            }
            #wrapper {
                height:100%;
                min-width:1120px; /* 250px each side (content width is 870px) */
                max-width:2000px;
                background-image:url(bg.png);
                background-position:50% 25px;
                background-repeat:no-repeat;
                background-size:cover;
            }
        </style>
    </head>
    <body>
        <div id="wrapper">
            <!-- web content -->
        </div>
    </body>
</html>

This does not resize the wrapper to the height of the window. When I remove the min- and use height, it'll work. But I have to have the content height variable...

I did find some other posts here on SO and on google, but they have just questions and no solution.

See Question&Answers more detail:os

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1 Answer

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by (71.8m points)

When you use a percentage value for height, it will always be relative to the specified height of the parent element. Not the actual height of the parent element, but the height specified in CSS.

So when your body element has no height specified (only min-height, but that does not count), the 100% will not be able to take effect.

One possible solution is to use position: absolute; top: 0; bottom: 0; on your #wrapper, and your div will be stretched. This of course might have some layout consequences that you do not want.

jsFiddle Demo


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