I got a sidebar vertical menu which need to add an icon on left before each of item, I've try the way below but can't show up the icon:
sidebar menu:
<div class="sidemenu-wrapper">
    <h3 class="section-title">store</h3>
    <div class="sidebar-filter">    
        <div class="store">
            <ul>
                <li class="ico_01"><a href="../profile">shop profile</a></li>
                <li class="ico_02"><a href="../products">my products</a></li>
                <li class="ico_03"><a href="../sales">my sales</a></li>
                <li class="ico_04"><a href="../income">my income</a></li>
            </ul>
        </div>
    </div><!-- /.sidebar-filter -->
</div>
CSS:
.sidemenu-wrapper .store ul > li {
    background: url('../images/sidemenu-ico.png') no-repeat;
    height: 46px;
}
.sidemenu-wrapper .store ul > li.ico_01 {
    background-position: 0 0;
}
.sidemenu-wrapper .store ul > li.ico_02 {
    background-position: 0 46px !important;
}
.sidemenu-wrapper .store ul > li.ico_03 {
    background-position: 0 92px !important;
}
sidemenu-ico.png:
I've refer to use CSS sprites for list (<li>) background image, try example as given, still no luck.
 
     
    