页脚内部无序排列不起作用

Question

I want the unordered list to be centered in relation to the footer div, but I can't get this to work for some reason. My concern is that my stickyfooter might have anything to do with it, but I really don't know. Help appreciated.

EDIT: It would also appear that I cannot margin-top any element inside #footer .

HTML:

<div id="footer">
<ul>
    <li>Item1</li>
    <li>Item2</li>
    <li>Item3</li>
    <li>Item4</li>
        <li>Item5</li>
        <li>Item6</li>
        <li>Item7</li>
        <li>Item8</li>
            <li>Item9</li>
            <li>Item10</li>
            <li>Item11</li>
            <li>Item12</li>
</ul>
</div>

CSS:

#footer {
    height: 200px;
    background: linear-gradient(#545454, #3B3B3B); /* IE9- needs fix */ 
    position: relative;
    margin-top: -200px;
    clear: both;
    bottom: 0;
}

    #footer ul {
        width: 450px;
        margin: 50px auto; /* This is the part that doesn't work.. */
        font-size: 13px;
        color: white;
        -webkit-column-count: 3; /* Chrome, Safari, Opera */
        -moz-column-count: 3; /* Firefox */
        column-count: 3; /* Standard */
        -webkit-column-gap: 0; /* Chrome, Safari, Opera */
        -moz-column-gap: 0; /* Firefox */
        column-gap: 0; /* Standard */
    }

        #footer li {
            width: 150px;
            display: inline-block;
            margin: 5px;
        }

Answer 1

This is a margin collapse problem.

Look at this demo http://jsfiddle.net/WfGej/ and fix your #footer with

   border-top:1px solid transparent;

like this : http://jsfiddle.net/WfGej/1/