This div is smaller than 400px (height) but the min-height property ensures that 400px is reached.
Feel free to copy the source code if you like.
This div differs from the first one.
It's height is set to 100% which means
if the content goes more than 400px the div will stretch.
If we left it at 400px any surplus content
would go beyond the div.
I think that if I keep talking
about nothing
in particular then
you will see what i mean
about the div
expanding past 400px.
See what I mean? Good.