diff --git a/assets/scss/_brand.scss b/assets/scss/_brand.scss
index 1fb2119a25..2d5c5a4cf4 100644
--- a/assets/scss/_brand.scss
+++ b/assets/scss/_brand.scss
@@ -1,3 +1,5 @@
+// stylelint-disable no-duplicate-selectors
+
 //
 // Brand guidelines
 //
diff --git a/assets/scss/_component-examples.scss b/assets/scss/_component-examples.scss
index 2a2c740b35..3d216991af 100644
--- a/assets/scss/_component-examples.scss
+++ b/assets/scss/_component-examples.scss
@@ -1,4 +1,4 @@
-// stylelint-disable selector-no-qualifying-type
+// stylelint-disable no-duplicate-selectors, selector-no-qualifying-type
 
 //
 // Grid examples
diff --git a/assets/scss/_content.scss b/assets/scss/_content.scss
index b8311495cf..112370a2da 100644
--- a/assets/scss/_content.scss
+++ b/assets/scss/_content.scss
@@ -1,4 +1,4 @@
-// stylelint-disable selector-max-combinators, selector-max-compound-selectors, selector-max-type, selector-no-qualifying-type
+// stylelint-disable no-duplicate-selectors, selector-max-combinators, selector-max-compound-selectors, selector-max-type, selector-no-qualifying-type
 
 //
 // Automatically style Markdown-based tables like a Bootstrap `.table`.
diff --git a/build/.stylelintrc b/build/.stylelintrc
index 8fa3104909..0027d7a082 100644
--- a/build/.stylelintrc
+++ b/build/.stylelintrc
@@ -32,7 +32,7 @@
     "media-feature-range-operator-space-after": "always",
     "media-feature-range-operator-space-before": "never",
     "no-descending-specificity": null,
-    "no-duplicate-selectors": null,
+    "no-duplicate-selectors": true,
     "number-leading-zero": "never",
     "order/properties-order": [
       "position",
diff --git a/scss/_card.scss b/scss/_card.scss
index ad4221806b..25c511a90b 100644
--- a/scss/_card.scss
+++ b/scss/_card.scss
@@ -17,6 +17,18 @@
     margin-right: 0;
     margin-left: 0;
   }
+
+  > .list-group:first-child {
+    .list-group-item:first-child {
+      @include border-top-radius($card-border-radius);
+    }
+  }
+
+  > .list-group:last-child {
+    .list-group-item:last-child {
+      @include border-bottom-radius($card-border-radius);
+    }
+  }
 }
 
 .card-body {
@@ -49,21 +61,6 @@
   }
 }
 
-.card {
-  > .list-group:first-child {
-    .list-group-item:first-child {
-      @include border-top-radius($card-border-radius);
-    }
-  }
-
-  > .list-group:last-child {
-    .list-group-item:last-child {
-      @include border-bottom-radius($card-border-radius);
-    }
-  }
-}
-
-
 //
 // Optional textual caps
 //
diff --git a/scss/_tables.scss b/scss/_tables.scss
index 32384391e1..6bd0b91a43 100644
--- a/scss/_tables.scss
+++ b/scss/_tables.scss
@@ -103,6 +103,7 @@
 //
 // Same table markup, but inverted color scheme: dark background and light text.
 
+// stylelint-disable-next-line no-duplicate-selectors
 .table {
   .thead-dark {
     th {