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diff --git a/assets/sass/@primer/css/layout/README.md b/assets/sass/@primer/css/layout/README.md
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+---
+bundle: "layout"
+generated: true
+---
+
+# Primer CSS: `layout` bundle
+
+## Usage
+
+Primer CSS source files are written in [SCSS]. To include this Primer CSS module in your own build, ensure that your `node_modules` directory is listed in your Sass include paths, then import it with:
+
+```scss
+@import "@primer/css/layout/index.scss";
+```
+
+## Build
+
+The `@primer/css` npm package includes a standalone CSS build of this module in `dist/layout.css`.
+
+## License
+
+[MIT](https://github.com/primer/css/blob/master/LICENSE) © [GitHub](https://github.com/)
+
+
+[scss]: https://sass-lang.com/documentation/syntax#scss
diff --git a/assets/sass/@primer/css/layout/container.scss b/assets/sass/@primer/css/layout/container.scss
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+++ b/assets/sass/@primer/css/layout/container.scss
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+// Fixed-width, centered column for site content.
+// Handy container styles that match our breakpoints
+
+// 544px
+.container-sm {
+  max-width: $width-sm;
+  margin-right: auto;
+  margin-left: auto;
+}
+
+// 768px
+.container-md {
+  max-width: $container-md;
+  margin-right: auto;
+  margin-left: auto;
+}
+
+// 1004px - this matches the current fixed width: 980px + padding: px-3
+.container-lg {
+  max-width: $container-lg;
+  margin-right: auto;
+  margin-left: auto;
+}
+
+// 1280px
+.container-xl {
+  max-width: $container-xl;
+  margin-right: auto;
+  margin-left: auto;
+}
diff --git a/assets/sass/@primer/css/layout/grid-offset.scss b/assets/sass/@primer/css/layout/grid-offset.scss
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+++ b/assets/sass/@primer/css/layout/grid-offset.scss
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+// Optional offset options to work with grid.scss
+
+// Offset Columns
+
+@each $breakpoint, $variant in $responsive-variants {
+  @include breakpoint($breakpoint) {
+    .offset#{$variant}-1 { margin-left: (1 / 12 * 100%) !important; }
+    .offset#{$variant}-2 { margin-left: (2 / 12 * 100%) !important; }
+    .offset#{$variant}-3 { margin-left: (3 / 12 * 100%) !important; }
+    .offset#{$variant}-4 { margin-left: (4 / 12 * 100%) !important; }
+    .offset#{$variant}-5 { margin-left: (5 / 12 * 100%) !important; }
+    .offset#{$variant}-6 { margin-left: (6 / 12 * 100%) !important; }
+    .offset#{$variant}-7 { margin-left: (7 / 12 * 100%) !important; }
+    .offset#{$variant}-8 { margin-left: (8 / 12 * 100%) !important; }
+    .offset#{$variant}-9 { margin-left: (9 / 12 * 100%) !important; }
+    .offset#{$variant}-10 { margin-left: (10 / 12 * 100%) !important; }
+    .offset#{$variant}-11 { margin-left: (11 / 12 * 100%) !important; }
+  }
+}
diff --git a/assets/sass/@primer/css/layout/grid.scss b/assets/sass/@primer/css/layout/grid.scss
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+++ b/assets/sass/@primer/css/layout/grid.scss
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+// GRID
+
+// Columns
+.col-1 { width: (1 / 12 * 100%); }
+.col-2 { width: (2 / 12 * 100%); }
+.col-3 { width: (3 / 12 * 100%); }
+.col-4 { width: (4 / 12 * 100%); }
+.col-5 { width: (5 / 12 * 100%); }
+.col-6 { width: (6 / 12 * 100%); }
+.col-7 { width: (7 / 12 * 100%); }
+.col-8 { width: (8 / 12 * 100%); }
+.col-9 { width: (9 / 12 * 100%); }
+.col-10 { width: (10 / 12 * 100%); }
+.col-11 { width: (11 / 12 * 100%); }
+.col-12 { width: 100%; }
+
+@each $breakpoint in map-keys($breakpoints) {
+  @include breakpoint($breakpoint) {
+    .col-#{$breakpoint}-1 { width: ( 1 / 12 * 100%); }
+    .col-#{$breakpoint}-2 { width: ( 2 / 12 * 100%); }
+    .col-#{$breakpoint}-3 { width: ( 3 / 12 * 100%); }
+    .col-#{$breakpoint}-4 { width: ( 4 / 12 * 100%); }
+    .col-#{$breakpoint}-5 { width: ( 5 / 12 * 100%); }
+    .col-#{$breakpoint}-6 { width: ( 6 / 12 * 100%); }
+    .col-#{$breakpoint}-7 { width: ( 7 / 12 * 100%); }
+    .col-#{$breakpoint}-8 { width: ( 8 / 12 * 100%); }
+    .col-#{$breakpoint}-9 { width: ( 9 / 12 * 100%); }
+    .col-#{$breakpoint}-10 { width: ( 10 / 12 * 100%); }
+    .col-#{$breakpoint}-11 { width: ( 11 / 12 * 100%); }
+    .col-#{$breakpoint}-12 { width: 100%; }
+  }
+}
+
+// Gutters
+// Apply padding and a negative margin to the outside of the container
+@mixin gutters ($gutter-width: $spacer-3) {
+  margin-right: -$gutter-width;
+  margin-left: -$gutter-width;
+
+  > [class*="col-"] {
+    padding-right: $gutter-width !important;
+    padding-left: $gutter-width !important;
+  }
+}
+
+.gutter {
+  @include gutters($spacer-3);
+}
+
+.gutter-condensed {
+  @include gutters($spacer-2);
+}
+
+.gutter-spacious {
+  @include gutters($spacer-4);
+}
+
+@each $breakpoint in map-keys($breakpoints) {
+  @include breakpoint($breakpoint) {
+    .gutter-#{$breakpoint} { @include gutters($spacer-3); }
+    .gutter-#{$breakpoint}-condensed { @include gutters($spacer-2); }
+    .gutter-#{$breakpoint}-spacious { @include gutters($spacer-4); }
+  }
+}
diff --git a/assets/sass/@primer/css/layout/index.scss b/assets/sass/@primer/css/layout/index.scss
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+++ b/assets/sass/@primer/css/layout/index.scss
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+@import "../support/index.scss";
+@import "./container.scss";
+@import "./grid.scss";
+@import "./grid-offset.scss";