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    <p>You have a number of things going on here that aren't quite right.</p> <pre><code>// If this is part of a reusable library, use the default flag // I typically prefer prefixing global variables to avoid collisions with other code // (eg. $grid-colCount instead of $colCount) $colCount: 2 !default; $colSpan: 1 !default; $gutter: 4% !default; // Mixin changed to a function, better for its intended purpose @function width($colCount: $colCount, $colSpan: $colSpan, $gutter: $gutter) { @return $colSpan * ((100% - $gutter) / $colCount); } // The arguments are set to our global variables by default @mixin columns($colCount: $colCount, $colSpan: $colSpan, $gutter: $gutter) { @content; // Something weird was going on here that just plain didn't compile width: width($colCount, $colSpan, $gutter); &amp;.first { // This is where your mixin was getting messed up, // it wasn't passing the values it received on to the mixins @include first($colCount, $colSpan, $gutter); } &amp;.only { @include only($colCount, $colSpan, $gutter); } &amp;.firstOnly { @include firstOnly($colCount, $colSpan, $gutter); } } @mixin first($colCount: $colCount, $colSpan: $colSpan, $gutter: $gutter) { margin-left: 100% - width($colCount, $colSpan, $gutter); } @mixin only($colCount: $colCount, $colSpan: $colSpan, $gutter: $gutter) { margin-left: 100% - (2 * width($colCount, $colSpan, $gutter)) - (2 * $gutter); } @mixin firstOnly($colCount: $colCount, $colSpan: $colSpan, $gutter: $gutter) { margin-left: 100% - width($colCount, $colSpan, $gutter) - $gutter; margin-right: 100% - width($colCount, $colSpan, $gutter); } </code></pre> <p>When we call the mixins like this:</p> <pre><code>.test { @include columns(3, 8, 40%); } .test2 { @include columns; } </code></pre> <p>We get this result:</p> <pre><code>.test { width: 160%; } .test.first { margin-left: -60%; } .test.only { margin-left: -300%; } .test.firstOnly { margin-left: -100%; margin-right: -60%; } .test2 { width: 48%; } .test2.first { margin-left: 52%; } .test2.only { margin-left: -4%; } .test2.firstOnly { margin-left: 48%; margin-right: 52%; } </code></pre>
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