Floated elements must have a width specified, as in the example above. Otherwise, the element will assume the full width of its containing element.
I can’t understand it. If the width of floated element is not specified, the element will assume the full width of its containing element? What does it mean?
The link is here. Actually, the .box-bottom didn’t specify its width, so no “example above” for reference.
Thanks for your help.