I use AJAX CSS as an example:
.ajax__combobox_textboxcontainer .ajax__combobox_textboxcontainer input .ajax__combobox_buttoncontainer button .ajax__combobox_itemlist
after "." there is the name of the control set, double underline, the name of the control, and then the name of the part of this control that is created in the style. This is very verbose and definitely helps to avoid conflict. I recommend using this approach.
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