themouette/fossil-core

samples/todo/bourbon/functions/_px-to-em.scss

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// Convert pixels to ems
// eg. for a relational value of 12px write em(12) when the parent is 16px
// if the parent is another value say 24px write em(12, 24)

@function em($pxval, $base: 16) {
  @return ($pxval / $base) * 1em;
}