.ui-autocomplete {
        max-height: 300px;
        overflow-y: auto;
        /* prevent horizontal scrollbar */
        overflow-x: hidden;
    }
    /* IE 6 doesn't support max-height
     * we use height instead, but this forces the menu to always be this tall
     */
    * html .ui-autocomplete {
        height: 300px;
    }
.ui-autocomplete-loading, .ui-autocomplete-delay-preloading {
    background: #FFFFFF url('https://images.parkrun.com/website/general/ajax-spinner.gif') right center no-repeat;
}