@function em2px($emval, $base: $em-base){
    @if not unitless($emval){
        $emval: strip-units($emval);
    }
    @if not unitless($base) {
        $base: strip-units($base);
    }
    @return ($emval * $base) + 0px;
}



// str-replace() - Replace in a string
//
// @param {string}  $string    String that you want to replace
// @param {string}  $substr    String that is to be replaced by `$newsubstr`
// @param {string}  $newsubstr String that replaces `$substr`
// @param {number*} $all       Flag for replaceing all (1+) or not (0)
// @return {string}
@function str-replace($string, $substr, $newsubstr, $all: 0) {
    $position-found: str-index($string, $substr);
    $processed: ();

    @while ($position-found and $position-found > 0) {
        $length-substr: str-length($substr);
        @if (1 != $position-found) {
            $processed: append($processed, str-slice($string, 0, $position-found - 1));
        }
        $processed: append($processed, $newsubstr);
        $string: str-slice($string, $position-found + $length-substr);

        $position-found: 0;

        @if ($all > 0) {
            $position-found: str-index($string, $substr);
        }
    }

    $processed: append($processed, $string);
    $string: "";

    @each $s in $processed {
        $string: #{$string}#{$s};
    }

    @return $string;
}