Get Combo of two classes at same tag by Css.

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<div class="treeview-menu menu-open"  >  User Menu </div>
Issue: To get the combination of two classes "treeview-menu " and  "menu-open" , we have to call like this:

Solution:

 div .treeview-menu.menu-open{
 background-color:#f00;
 color:#000
}
Notice: There is no single space between both classes.

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