I'm trying to create a div that would have a dynamic width depending on the content inside that div. It works well in Firefox but in IE I get linebreaks, see screenshot below:

The markup looks like this:
<div class="filter-dropdown">
    <div class="filter-dropdown-options-wrapper">
        <ul>
            <li>
                <label>
                    <input type="checkbox" checked="checked">(Select All)
                </label>
            </li>
            <li>
                <label>
                    <input type="checkbox" value="2010-01-31" checked="checked">2010-01-31
                </label>
            </li>
        </ul>
    </div>
    <div class="filter-btn-wrapper">
        <input type="button" value="Ok" class="btn-filter-ok">
        <input type="button" value="Cancel" class="btn-filter-cancel">
    </div>
</div>
and CSS looks like this:
 .filter-wrapper div.filter-dropdown{
 position:absolute;
 top:-190px;
 right:10px;
 border:1px solid #CFD6DA;
 z-index:10000;
 display:none;
 padding:10px;
 height:170px;
 background-color:#EEF1F2;
}
.filter-wrapper div.filter-dropdown .filter-dropdown-options-wrapper{
 border:1px solid #CFD6DA;
 padding:5px 10px;
 height:130px;
 overflow-y:auto;
 background-color:#FFFFFF;
 width:100%;
}
.filter-wrapper div.filter-dropdown .filter-dropdown-options-wrapper ul{
 list-style:none;
 padding-left:0px;
 margin:0px;
}
.filter-wrapper div.filter-dropdown .filter-dropdown-options-wrapper ul li label{
 display:block;
}
.filter-wrapper div.filter-dropdown .filter-btn-wrapper{
 margin-top:10px;
 text-align:right;
 width:130px;
}
.filter-wrapper div.filter-dropdown .filter-btn-wrapper .btn-filter-ok{
 margin-right:5px;
 width:60px;
}
So, my question is - what do I have to do in order to avoid linebreaks and keep width of the outer div dynamic?