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CSS CSS Layout Basics Getting Started with CSS Layout Creating a Sticky Footer

Posted by Darrell Osborne
Darrell Osborne
23,146 Points

p:last-child margin-bottom set to zero

I was following along with the previous workspace for the sticky footer, and after adding the .wrap class, rule, and calc, the footer was still being pushed a few pixels beyond the view port. I noticed that the new workspace for this video had added the p:last-child rule and set the bottom margin to zero. Once I added that to the previous workspace all was well.

Just wondering why was zeroing out the bottom margin necessary for the calc function to work the way we wanted?

1 Answer

Guil Hernandez
STAFF
Guil Hernandez
Treehouse Teacher
Guil Hernandez
Guil Hernandez
Treehouse Teacher

Hi Darrell Osborne,

The :last-child rule is for this lesson only -- it's not usually necessary. By default, that paragraph's bottom margin collapses with the footer so it pushes it down a few extra pixels. Normally, that content might be in a floated or inline-block column, so you wouldn't experience the collapsing margin. Even adding a little bottom padding to .container would prevent it from collapsing and pushing the footer beyond the viewport -- try it. :)

Again, for this example, I only wanted to focus on the .wrap element, the footer and calc() function. You'll learn more about the rest in the next sections. :)

Darrell Osborne
Darrell Osborne
23,146 Points

Thanks Guil Hernandez! I wondered if that was the case shortly after I posted the question, but didn't have time until now to mess around with it. Thanks for explaining!