Any way to limit border length?

Is there any way to limit the length of a border. I have a

that has a bottom border, but I want to add a border on the left of the

that only stretches half of the way up.

Is …

Sass negative variable value?

I have a couple of scss selectors where I use the same amount positive and negative, as in:

padding: 0 15px 15px;
margin: 0 -15px 20px -15px;
I’d prefer to use a variable for all the 15px amounts, …