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diff --git a/assets/sass/@primer/css/header/README.md b/assets/sass/@primer/css/header/README.md
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+++ b/assets/sass/@primer/css/header/README.md
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+---
+bundle: "header"
+generated: true
+---
+
+# Primer CSS: `header` 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/header/index.scss";
+```
+
+## Build
+
+The `@primer/css` npm package includes a standalone CSS build of this module in `dist/header.css`.
+
+## License
+
+[MIT](https://github.com/primer/css/blob/master/LICENSE) &copy; [GitHub](https://github.com/)
+
+
+[scss]: https://sass-lang.com/documentation/syntax#scss
diff --git a/assets/sass/@primer/css/header/header.scss b/assets/sass/@primer/css/header/header.scss
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+++ b/assets/sass/@primer/css/header/header.scss
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+.Header {
+  z-index: 32; // TODO: Figure out z-index system
+  display: flex;
+  padding: $spacer-3;
+  font-size: $h5-size;
+  line-height: $lh-default;
+  // stylelint-disable-next-line primer/colors
+  color: $white-fade-70;
+  background-color: $bg-gray-dark;
+  align-items: center;
+  flex-wrap: nowrap;
+}
+
+.Header-item {
+  display: flex;
+  margin-right: $spacer-3;
+  align-self: stretch;
+  align-items: center;
+  flex-wrap: nowrap;
+}
+
+.Header-item--full {
+  flex: auto;
+}
+
+.Header-link {
+  font-weight: $font-weight-bold;
+  color: $text-white;
+  white-space: nowrap;
+
+  &:hover,
+  &:focus {
+    // stylelint-disable-next-line primer/colors
+    color: $white-fade-70;
+    text-decoration: none;
+  }
+}
diff --git a/assets/sass/@primer/css/header/index.scss b/assets/sass/@primer/css/header/index.scss
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+++ b/assets/sass/@primer/css/header/index.scss
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+@import "../support/index.scss";
+@import "./header.scss";