JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.11/themes/base/jquery-ui.css">
<input type="text" id="auto">

CSS

ul.ui-autocomplete.ui-menu{width:100}

/* 
    targets the first result's <a> element, 
    remove the a at the end to target the li itself 
*/
ul.ui-autocomplete.ui-menu li:first-child a{
    color:blue;
}

JavaScript

$('#auto').autocomplete({'source':
    ['abc','abd','abe','abf','jkl','mno','pqr','stu','vwx','yz']
});