Briefly describe each of the following CSS overflow values: visible, hidden, scroll and auto. Indicate which of these four values is the default.

What will be an ideal response?

CSS overflow values include the following:

visible (default):  Content overflow is visible but appears outside the containing element
hidden:  Content overflow is hidden from the visitor
scroll:  Content overflow is hidden, but scrollbars appear to allow visitors to view the content
auto:  If content overflows, scrollbars appear; if content does not overflow, scrollbars do not appear