Why is my CSS causing a div with 100% width to be slightly taller than expected?

I am working on a website that I want to adjust to the width of different browsers.

Everything seems to be functioning properly, except for the fact that the parent div containing the 100% width divs always appears around 5 pixels too tall. This is causing issues with the background color overflowing at the bottom.

Can anyone explain why this is happening? And how can I go about fixing it? :-)

Best regards, Jan

Here is the code snippet for the head section:

<style type="text/css">

body { background-color:#e7e3d7; margin-left:0px; margin-right:0px; margin-top:0px; margin-bottom:0px; }    
.banner { width: 100%; }

</style>

Code for the body section:

<div style="background-color:#0000ff;">

<div><img class="banner" src="http://www.janriggert.com/images/footer.png"></div>

</div>

Are you noticing that blue line below the footer? It shouldn't be there... :-/

csshtmlwidth

Answer №1

To ensure responsive design, apply max-width:100% and display:block to the image element.

Explore further in this interactive demo: http://jsfiddle.net/RyEqK/1/

Answer №2

The correct solution mentioned is to add display:block, however, it does not explain the reasoning behind it.

By default, <img> elements are set to display: inline;. Inline-block elements like <svg> and <img> align with the text baseline. These elements act as if they are 'in a line' (hence inline) and follow the rules of the line.

The additional space at the bottom is reserved for characters that extend below the baseline, known as descenders. Examples include the tails on letters like 'y' and 'g'.

To eliminate this extra space, you can apply display: block; to your img element.

This answer on Stack Overflow provides a thorough explanation with many examples for images.

For svgs, which also default to inline display, this Stack Overflow answer offers a comprehensive explanation.

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