CSS3子元素宽度不尊重父容器宽度

Question

I am trying to keep my ul and li elements that are inside of a div to respect the div's width with margin-left: auto. I am also not wanting ul/li to extend out of the div. I want the ul and li elements to stay inside the div container. From what I have read, this code is correct because I have the child elements contain a width which should be according to div's width.

#phonequeue {
    display: block;
    width: 400px;
    height: 800px;
    border-width: 5px;
    border-color: white;
    border-style: solid;
    float: right;
    margin-top: -650px;
}

li {
    display: block;
    padding: 15px;
    text-align: left;
    height: 1.2 em
    padding-left: 15px;
    padding-right: 15px;
    margin: 0px 0px 4px 0px;
    background-color #555
    -webkit-border-radius: 15px;
    border-radius: 40px;
    background: -webkit-gradient(linear, 0% 0%, 0% 30%, from(#444), to(#111));
    font-family: verdana, arial, helvetica, sans-serif;
    font-size: 22px;
    width: 100%;
    margin: auto;

}

ul {
    list-style-type: none;
    width: 100%;
    margin: auto;
}

index.html:

    <div id="phonequeue"> 
    <ul>
        <li class="avail">
        <span class="pname">John Doe</span>
        <span class="ptime">03:00</span>
        </li>
    </ul>
    </div>

UPDATE: Here is a working example. The element width is 430px; when the parent div is 400px;. I would the child elements to center themselves in div and have their width respecting the parents width. http://jsfiddle.net/FBvQJ/4/

Answer 1

I believe the problem was with the use of width: 100%

Check this jsFiddle and let me know if this answers your question.

This is the updated CSS to solve the overlapping width:

phonequeue {
    display: block;
    width: 200px;
    border: 1pt solid green;
}
ul{
    border: 1pt solid red;
    list-style-type: none;
    margin: auto;
    padding: 0;
}
li {
    display: block;
    padding: 15px;
    text-align: left;
    height: 1.2em;
    margin: 0px 0px 4px 0px;
    -webkit-border-radius: 15px;
    font-size: 22px;
    margin: auto;
    border: 1pt solid #ccc;
}

I don't think you need to define the full width for each element.

Answer 2

If you'd like the text centered in the DIV, remove the width on the LI tag and make the margin:

margin: 0px auto 4px auto;

That will center the text within the div.

Answer 3

If I'm understanding your question correctly (which is dubious) I believe you can achieve the centering you require by removing the 100% widths and using text-align:center:

li {
    display: block;
    padding: 15px;
    text-align: left;
    height: 1.2 em;
    padding-left: 15px;
    padding-right: 15px;
    margin: 0px auto 4px auto;
    background-color #555;
    -webkit-border-radius: 15px;
    border-radius: 40px;
    background: -webkit-gradient(linear, 0% 0%, 0% 30%, from(#444), to(#111));
    font-family: verdana, arial, helvetica, sans-serif;
    font-size: 22px;
    text-align:center; /* < this (or not, if you don't actually want it centred after all) */
}

ul {
    list-style-type: none;
    padding:0; /* < and this */
    margin: 0;
}

Demo fiddle

And later, when you decide that you want the time on the right use

.ptime {float:right;} 

example