title: Combining rem & pixel in calc() in LESS
body: <p>Hi I'm wondering if there's a way I can use a combination of units of measurements in LESS's calc function. If not, does sass or any other CSS preprocessor have this capability? </p>
  
  <p>e.g. something like: </p>
  
  <pre><code>.target {
      height: calc(5rem-1px); //FYI, this doesn't work I tried it.
  }
  </code></pre>
  
  <p>Thank You!</p>