How to format the #combo_filter?

I’d like to change the font to have the same font-size, font-weight… in the combo_filter as in the grid. How to access to its .css() ?

There is no possibility to customize the combo filter look with the API.
Please, try to use the following CSS in this case:

.dhx_combobox-input{
    font-size:18px;
    color:green
}

.dhx_list-item, .dhx_list-item--text{
    font-size:18px;
    color:green
}

/*for the multiselect combo*/
.dhx_combobox-tag__value{ 
    font-size:18px;
    color:green
}

Here is a simple example:
https://snippet.dhtmlx.com/d1nf5bus