ajax comboBox highlighted item css

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HTML

for an ajax comboBox which class should i override to change the css of the highlighted text when we enter into textbox and it matchs the entry in the list.

currently i m using these classes

<pre lang="HTML">

.ajax__combobox_itemlist
{

overflow-y: auto !important;
height: 150px !important;
z-index: 10 !important;
width: 150px !important;

}

.ajax__combobox_itemlist li
{
background-color: #fff !important;
color: #084B8A !important;
padding: 5px 5px 5px 5px !important;
}
.ajax__combobox_itemlist li:hover
{

background-color: #0174DF !important;
color: #EFFBF2 !important;
text-decoration: underline !important;
}