diff --git a/news/changelog-1.11.md b/news/changelog-1.11.md
index db98133f40..48af47cc38 100644
--- a/news/changelog-1.11.md
+++ b/news/changelog-1.11.md
@@ -144,6 +144,7 @@ All changes included in 1.11:
 - ([#15091](https://github.com/quarto-dev/quarto-cli/pull/15091)): Fix page-level `bread-crumbs`, `back-to-top-navigation`, `page-navigation`, `margin-header` and `margin-footer` options not being validated or offered for completion in editors. A page value of the wrong type now fails to render with an error instead of being accepted silently.
 - ([#15091](https://github.com/quarto-dev/quarto-cli/pull/15091)): Fix `open-graph: false` or `twitter-card: false` in page front matter or `_metadata.yml` not disabling Open Graph or Twitter Card metadata for that page when the website enables it.
 - ([#15114](https://github.com/quarto-dev/quarto-cli/pull/15114)): Fix a website category containing backticks showing broken text in the page title block, and a category containing a backslash, such as a Windows path, failing the render or losing its backslashes.
+- ([#15176](https://github.com/quarto-dev/quarto-cli/issues/15176)): Fix the listing styles of website projects overriding `!default` values of a theme, such as `$border-color`, `$border-radius` and the grays of Bootswatch themes. Websites now get the same theme colors as a standalone document. (author: @Don-Yin)
 - ([#15206](https://github.com/quarto-dev/quarto-cli/issues/15206)): Fix website listings attaching another update handler on every URL hash change, and an extra one per additional listing on the same page.
 - ([#15217](https://github.com/quarto-dev/quarto-cli/pull/15217)): Fix website listings updating twice for each click on a pagination link.
 
diff --git a/src/resources/projects/website/listing/quarto-listing.scss b/src/resources/projects/website/listing/quarto-listing.scss
index fb55eb8e5b..adef203b7f 100644
--- a/src/resources/projects/website/listing/quarto-listing.scss
+++ b/src/resources/projects/website/listing/quarto-listing.scss
@@ -77,7 +77,7 @@
   }
 }
 
-/*-- scss:variables --*/
+/*-- scss:defaults --*/
 
 // Since we use these colors, we need to ensure that they
 // are defined (for example, if no theme is specified)
diff --git a/tests/docs/smoke-all/2026/10/26/issue-15176/.gitignore b/tests/docs/smoke-all/2026/10/26/issue-15176/.gitignore
new file mode 100644
index 0000000000..ad293093b0
--- /dev/null
+++ b/tests/docs/smoke-all/2026/10/26/issue-15176/.gitignore
@@ -0,0 +1,2 @@
+/.quarto/
+**/*.quarto_ipynb
diff --git a/tests/docs/smoke-all/2026/10/26/issue-15176/_quarto.yml b/tests/docs/smoke-all/2026/10/26/issue-15176/_quarto.yml
new file mode 100644
index 0000000000..b94911d952
--- /dev/null
+++ b/tests/docs/smoke-all/2026/10/26/issue-15176/_quarto.yml
@@ -0,0 +1,6 @@
+project:
+  type: website
+
+format:
+  html:
+    theme: [default, custom.scss]
diff --git a/tests/docs/smoke-all/2026/10/26/issue-15176/custom.scss b/tests/docs/smoke-all/2026/10/26/issue-15176/custom.scss
new file mode 100644
index 0000000000..627245379d
--- /dev/null
+++ b/tests/docs/smoke-all/2026/10/26/issue-15176/custom.scss
@@ -0,0 +1,3 @@
+/*-- scss:defaults --*/
+$border-color: #ff0000 !default;
+$border-radius: 1rem !default;
diff --git a/tests/docs/smoke-all/2026/10/26/issue-15176/index.qmd b/tests/docs/smoke-all/2026/10/26/issue-15176/index.qmd
new file mode 100644
index 0000000000..76ee727fae
--- /dev/null
+++ b/tests/docs/smoke-all/2026/10/26/issue-15176/index.qmd
@@ -0,0 +1,10 @@
+---
+title: "issue-15176"
+_quarto:
+  tests:
+    html:
+      ensureCssRegexMatches:
+        - ['--bs-border-color:\s*#ff0000', '--bs-border-radius:\s*1rem']
+---
+
+A website theme sets `$border-color` and `$border-radius` with `!default`, and the listing styles must not override them.