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CSS Sass Basics (retired) Advanced Sass Concepts Advanced Mixin Arguments

I get an error whenever I try to switch the order of the arguments.

Whenever I switch the $size and $color: black arguments to be "$color: black, $size" I get an error saying that I have the wrong parameters despite switching the order of the variables from "10px, red" to "red, 10px."

index.html
<!DOCTYPE html>
<html>
<head>
  <title>Sass Basics - Code Challenge</title>
  <link rel="stylesheet" type="text/css" href="page-style.css">
  <link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
  <div class="box"></div>
  <div class="red"></div>
  <div class="orange"></div>
  <div class="yellow"></div>
  <div class="green"></div>
</body>
</html>
style.scss
/* Write your SCSS code below. */

@mixin square($color: black, $size) {
  border: 1px solid $color;
  width: $size;
  height: $size;
}

.box {
  @include square(red, 10px);
}