Use Calc For Dimensions

Design help General
1

Before I get started let me just say that I haven’t used Webflow since 2013 and a lot has changed.

Anyway I decided to try using Webflow for a recent project - http://code-cards.webflow.io/

I’ve came across a few annoyances. I can’t set the image source to be empty or have height: calc(100% - 40px).

How can I add height: calc(100% - 40px); to an element? For example the images on http://code-cards.webflow.io/

Here’s what I’m trying to accomplish in Webflow:
http://codepen.io/mikethedj4/pen/YWgNxQ?editors=0100

2

For now, you can apply this property by using the custom code, on the page settings tab or inside the embed code widget right on the page.

3

Looks like I’d have to pay for that. Большое спасибо