I am looking at the mixin documentation and have created a simple mixin
@mixin mobile-pos($property, $offset) {
    // Fallback
    #{$property}: calc(100vh - $offset);
    // Better - for browsers that support custom css vars
    #{$property}: calc(var(--rvh) * 100 - $offset);
}
Here is how I'm using the mixin
#container-circles {
    bottom: unset;
    @include mobile-pos(top, 90px);
}
I checked the compiled CSS output
#container-circles {
  bottom: unset;
  top: calc(100vh - $offset);
  top: calc(var(--rvh) * 100 - $offset); }
Any idea why the second param is not getting compiled properly? I'm using node-sass 4.11.0
 
     
    