//** Unit-less `line-height` for use in components like buttons.
$line-height-base: 1.75 !default; // 20/14?
$btn-lineheight: 1.5 !default;
//** Computed "line-height" (`font-size` * `line-height`) for use with `margin`, `padding`, etc.
$line-height-computed: floor(($font-size-base * $line-height-base)) !default; // ~20px