Is it possible to modify the column header font and background color of the Multiselect Widget?

also for the visual multiselect field 

is it possible to modify the column header font and background color

thanks

You can add the code below to the Custom CSS area of the Multiselect widget to change its background color and font. Simply change the values of the yellow highlighted text based on your preference.

.custom-header {

    background-color: red !important;

    font-family: Arial;

}

To open the Custom CSS area, click the wand icon on the widget.

Click the Custom CSS tab and paste the css there.

Here's how it should look after:

If you need further assistance, please let us know.
Cheers.