I'm trying to use the calc() function in a Sass stylesheet, but I'm having some issues. Here's my code: $body_padding: 50px body padding-top: $body_padding height: calc(100% - $body_padding) If I use the literal 50px instead of my body_padding variable, I get exactly what I want. However, when I switch to the variable, this is the output: body { padding-top: 50px; height: calc(100% - $body_padding