What did I do wrong?

Question

css

You need to make a button, like this on the layout:
Here's what I got:
Code: codepen.io/anon/pen/PPaBNP
Why aren't the edges transparent?

Answer 1

instead of border
codepen.io/anon/pen/pjKZwd
or use
codepen.io/anon/pen/NGzBgp