skins/night/autocomplete-list-skin.css

.yui3-skin-night [for=ac-input] { /* autocomplete label color */
    color: #CBCBCB;
}

.yui3-skin-night .yui3-aclist-content {
    font-size: 100%;
    background-color: #151515;
    color: #ccc;
    border: 1px solid #303030;
    -moz-box-shadow: 0 0 17px rgba(0,0,0,0.58);
    -webkit-box-shadow: 0 0 17px rgba(0,0,0,0.58);
    box-shadow: 0 0 17px rgba(0,0,0,0.58);
}

.yui3-skin-night .yui3-aclist-item-active {
    background-color: #2F3030;
    background: -moz-linear-gradient(
        0% 100% 90deg,
        #252626 0%,
        #333434 100%
    );
    background: -webkit-gradient(
        linear,
        left top,
        left bottom,
        from(#333434),
        to(#252626)
    );
}
.yui3-skin-night .yui3-aclist-item-hover {
    background-color: #262727;
    background: -moz-linear-gradient(
        0% 100% 90deg,
        #202121 0%,
        #282929 100%
    );
    background: -webkit-gradient(
        linear,
        left top,
        left bottom,
        from(#282929),
        to(#202121)
    );
}

.yui3-skin-night .yui3-aclist-item {
    padding: 0 1em;   /*0.4em 1em 0.6em*/
    line-height: 2.25;
}
.yui3-skin-night .yui3-aclist-item-active { outline: none; }
.yui3-skin-night .yui3-highlight { color:#EFEFEF; }