Incorrect font size calculation

[rogden]

Following the documentation on the site, when setting the @base-font-size variable to your calculated body font size and calling the .font-size-rems() mixin, the incorrect font-size is being computed.

Steps:

1. Set the @base-font-size variable to 14 (no units as stated in the docs)
2. Set your body font-size to 87.5% (targeting a 14px font-size here)
3. Set an h1 font-size property to .font-size-rems(24)
4. Declare an h1 element in your markup
5. Inspect the computed font size. It is 27px.

Expected:
The computed font size should be 24px;