diff --git a/.changeset/spicy-wasps-clap.md b/.changeset/spicy-wasps-clap.md
new file mode 100644
index 00000000..45be6409
--- /dev/null
+++ b/.changeset/spicy-wasps-clap.md
@@ -0,0 +1,20 @@
+---
+"@sipe-team/accordion": patch
+"@sipe-team/checkbox": patch
+"@sipe-team/skeleton": patch
+"@sipe-team/divider": patch
+"@sipe-team/tooltip": patch
+"@sipe-team/button": patch
+"@sipe-team/switch": patch
+"@sipe-team/badge": patch
+"@sipe-team/input": patch
+"@sipe-team/radio": patch
+"@sipe-team/reset": patch
+"@sipe-team/card": patch
+"@sipe-team/flex": patch
+"@sipe-team/grid": patch
+"@sipe-team/side": patch
+"@sipe-team/typography": patch
+---
+
+Preserve CSS imports in `sideEffects` so consumer bundlers don't tree-shake `./styles.css`.
diff --git a/.templates/component/package.json b/.templates/component/package.json
index 5e2cb05f..68467154 100644
--- a/.templates/component/package.json
+++ b/.templates/component/package.json
@@ -61,6 +61,8 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false,
+  "sideEffects": [
+    "**/*.css"
+  ],
   "private": true
 }
diff --git a/packages/accordion/package.json b/packages/accordion/package.json
index f89f41f5..375de58b 100644
--- a/packages/accordion/package.json
+++ b/packages/accordion/package.json
@@ -71,5 +71,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/badge/package.json b/packages/badge/package.json
index 5811f1ec..023edaef 100644
--- a/packages/badge/package.json
+++ b/packages/badge/package.json
@@ -69,5 +69,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/button/package.json b/packages/button/package.json
index d1c3bc05..17a8e568 100644
--- a/packages/button/package.json
+++ b/packages/button/package.json
@@ -71,5 +71,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/card/package.json b/packages/card/package.json
index ddffe184..94d9a3c3 100644
--- a/packages/card/package.json
+++ b/packages/card/package.json
@@ -70,5 +70,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/checkbox/package.json b/packages/checkbox/package.json
index cc2e8576..2053700d 100644
--- a/packages/checkbox/package.json
+++ b/packages/checkbox/package.json
@@ -69,5 +69,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/divider/package.json b/packages/divider/package.json
index f30a34a4..86da3564 100644
--- a/packages/divider/package.json
+++ b/packages/divider/package.json
@@ -67,5 +67,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/flex/package.json b/packages/flex/package.json
index 3d350f5e..287db18d 100644
--- a/packages/flex/package.json
+++ b/packages/flex/package.json
@@ -68,5 +68,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/grid/package.json b/packages/grid/package.json
index 1ced490a..363c97c2 100644
--- a/packages/grid/package.json
+++ b/packages/grid/package.json
@@ -67,5 +67,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/input/package.json b/packages/input/package.json
index 198039b4..6f1b16c8 100644
--- a/packages/input/package.json
+++ b/packages/input/package.json
@@ -70,5 +70,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/radio/package.json b/packages/radio/package.json
index 56be8f09..8fab47b1 100644
--- a/packages/radio/package.json
+++ b/packages/radio/package.json
@@ -71,5 +71,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/reset/package.json b/packages/reset/package.json
index 83618d52..020e2a9c 100644
--- a/packages/reset/package.json
+++ b/packages/reset/package.json
@@ -53,5 +53,7 @@
       "./reset.css": "./dist/reset.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/side/package.json b/packages/side/package.json
index 9dff4583..088221fb 100644
--- a/packages/side/package.json
+++ b/packages/side/package.json
@@ -57,5 +57,7 @@
       "./styles.css": "./styles.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/skeleton/package.json b/packages/skeleton/package.json
index 74f1e517..fe81ae08 100644
--- a/packages/skeleton/package.json
+++ b/packages/skeleton/package.json
@@ -70,5 +70,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/switch/package.json b/packages/switch/package.json
index eca54739..1271d4d4 100644
--- a/packages/switch/package.json
+++ b/packages/switch/package.json
@@ -71,5 +71,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/tooltip/package.json b/packages/tooltip/package.json
index ed4ee714..32aa9ceb 100644
--- a/packages/tooltip/package.json
+++ b/packages/tooltip/package.json
@@ -70,5 +70,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }
diff --git a/packages/typography/package.json b/packages/typography/package.json
index 3759e93c..8fc2a522 100644
--- a/packages/typography/package.json
+++ b/packages/typography/package.json
@@ -70,5 +70,7 @@
       "./styles.css": "./dist/index.css"
     }
   },
-  "sideEffects": false
+  "sideEffects": [
+    "**/*.css"
+  ]
 }