I'm trying to do this:

html{
  font-size:62.5%;
}

body{
  @include rem(font-size, 14px);
  line-height:1.6;
}

But I believe the rem mixin gives me this with the following:
$browser-default-font-size: 16px; // Is this right?
$base-font-size: 10px !default; // Is this right?

html{
  font-size:62.5%;
}

body{
  font-size: 14px;
  font-size: .875rem;
}

I was expecting the following:

html{
  font-size:62.5%;
}

body{
  font-size: 14px;
  font-size: 1.4rem;
}