Unforeseen gap found between the div elements

I'm puzzled by the appearance of a mysterious blank space between two div elements. Here's the HTML code in question:

<div id="header">
    <img id="background" src="http://farm3.staticflickr.com/2847/11154210265_a8854fe5c5_h.jpg" alt="background" />
</div>          
<div id="menu">
    What could be causing the unexpected gap?
</div>

Here's the relevant CSS:

* {
margin: 0px;
padding: 0px;
}
#background {
max-width:100%;
max-height: 550px;
}
#menu {
background: rgb(170,200,189);
}

To see this issue in action, check out the JSFIDDLE link here: JSFIDDLE

htmlcss

Answer №1

The magic happens with the image tag.

Transform the image into a block element to resolve the problem.

#background { display: block }

Answer №2

The default setting for vertical-align is baseline. As a result, the img aligns itself with the baseline and creates a small gap below.

In addition to using display: block as recommended by @WillemLabu, there are other solutions available to address this issue. If there is no text present, you can apply a font-size property to the header.

#header {
    font-size: 0;
}

Check out this JSFiddle for an example.

Alternatively, adjust the vertical-align attribute accordingly.

#background {
    vertical-align: bottom;
}

Here's another JSFiddle demonstrating this adjustment.

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