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Drop-down menu CSS padding on <li> extends past container

I've got a CSS-only drop-down menu working just like I want it to, except I have to surround the text of each element with a <div>. The problem is that padding I apply to the <li> elements causes the element to extend outside the normal bounds of the list ( pic ). Is there any way to make this work without using divs?

<html>
<head>
    <title>CSS Menu Test</title>
<style>
div.menu { width: 1200px; background-color: #f8f8f8 }
div.menu a { text-decoration: none; color: Black; padding: 0; margin: 0 }
div.menu li { cursor: pointer; display:block; position: relative }
div.menu ul:first-child li { float: left; margin-right: 10px }
div.menu ul { list-style: none; margin: 0; padding: 0; float: left; background-color: #f4f4f4 ; display: block}
div.menu ul.childmenu { border: solid 1px black }
div.menu ul.childmenu li { width: 100% }
div.menu ul ul { display: none }
div.menu ul li:hover > div > ul { display: block; position: absolute; left: 0% }
div.menu ul li:hover > ul { display: block; position: absolute; left: 0% }
div.menu ul.childmenu li:hover > ul { display: block; position: absolute; left: 100%; top: 0% }
div.menu li:hover {  background-color: #88bbdd }

div.menu div { padding: 12px; }
/* would like to replace div.menu div with this:
div.menu li { padding: 12px; }
*/
</style>
</head>
<body>
<div class="menu">
    <ul>
        <li class="selected"><div>Services</div>
            <ul class="childmenu">
                <li>
                    <div>Ally</div>
                </li>
                <li>
                    <div>Business</div>
                    <ul class="childmenu">
                        <li><div>Accounting</div></li>
                        <li><div>Administrative</div></li>
                        <li>
                            <div>Legal</div>
                            <ul class="childmenu">
                                <li><div>Incorporation</div></li>
                                <li><div>Takeovers</div></li>
                                <li><div>Workers&nbsp;Comp</div></li>
                            </ul>

                        </li>
                        <li><div>Communication</div></li>
                    </ul>
                </li>
                <li><div>Personal</div></li>
            </ul>
        </li>
        <li><div>Company</div><ul class="childmenu">
            <li><div>Contact</div></li>
            <li><div>Employment</div></li>
        </ul>
        </li>
    </ul>
    <br style="clear: both" />
</div>
<h1>Content</h1>
</body>

edit The css box-sizing property can be used to tell the browser that 100% includes padding and borders. The default of content-box means the 100% refers to the content only and the padding and borders will make it larger ( plunker ):

div.menu li { box-sizing: border-box; }

These two lines in combination:

div.menu ul.childmenu li { width: 100% }
div.menu li { padding: 12px; }

are causing your problem. Your padding for the all li's in div.menu is getting added outside of your 100% width on li's inside of ul.childmenu. Changing your CSS rule for the ul.childmenu container to:

div.menu ul.childmenu { border: solid 1px black; padding-right: 24px; }

will pad the container on the right side by double the padding on the child li (accounting for both left and right padding) and give you a container that displays at the same width as its child.

You might need to be more specific with the CSS hierarchy; try:

div.menu ul li { padding: 12px; }

-æ.

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