The parent element of the footer,
.wrapper
, and its respective parent elements must all have a
min-height
equal to the viewport height. This is most easily set with the
100vh
value, including a fallback of
100%
for browsers that don't support viewport units.
The
.wrapper
element is set to
display: flex
with
flex-direction: column
.
The element above the footer,
.main
, is set to
flex-grow: 1
to "push" the footer to the bottom of the viewport, when its own content does not fill the screen.