Select all child elements recursively in CSS

How can you select all child elements recursively?

div.dropdown, div.dropdown > * {
    color: red;
}

This class only throws a class on the defined className and all immediate children. How can you, in a simple way, pick all childNodes like this:

div.dropdown, 
div.dropdown > *, 
div.dropdown > * > *, 
div.dropdown > * > * > *, 
div.dropdown > * > * > * > * {
    color: red;
}