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I would like to change the white color.

Hello friends. And where can I prescribe styles for drop-down lists and messages?

http:// prntscr . com/i7qecf

http:// prntscr . com/i7qg70

http:// prntscr . com/i7qif4

I would like to change the white color.

the drop down list are themed via the jQuery-UI Selectmenu 

you can change the jquery-ui theme from within the board settings or override the theme via your theme.css from your yaf theme

What messages did you mean? Your links can doesn't working!

Hello friends. And where can I prescribe styles for drop-down lists and messages?

http:// prntscr . com/i7qecf

http:// prntscr . com/i7qg70

http:// prntscr . com/i7qif4

I would like to change the white color.

the drop down list are themed via the jQuery-UI Selectmenu 

you can change the jquery-ui theme from within the board settings or override the theme via your theme.css from your yaf theme

What messages did you mean? Your links can doesn't working!

I need to change the drop-down list for my design. I can not find the file to change the .css code. Users I need to change the background tooltip

http://code.jquery.com/ui/1.12.1/themes/smoothness/jquery-ui.min.css 

Try to override it in your theme.css with...

.ui-selectmenu-text {
     background: black;
}

and the menu with

.ui-menu .ui-menu-item  {
     background: black;
}