diff --git a/pkg/web_css/lib/src/_footer.scss b/pkg/web_css/lib/src/_footer.scss
index 1b93de83b6..952cee7c24 100644
--- a/pkg/web_css/lib/src/_footer.scss
+++ b/pkg/web_css/lib/src/_footer.scss
@@ -1,3 +1,7 @@
+/* Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+   for details. All rights reserved. Use of this source code is governed by a
+   BSD-style license that can be found in the LICENSE file. */
+
 /******************************************************
   site footer
 ******************************************************/
diff --git a/pkg/web_css/lib/src/_home.scss b/pkg/web_css/lib/src/_home.scss
index 7afa41e169..8b70c070b7 100644
--- a/pkg/web_css/lib/src/_home.scss
+++ b/pkg/web_css/lib/src/_home.scss
@@ -1,3 +1,7 @@
+/* Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+   for details. All rights reserved. Use of this source code is governed by a
+   BSD-style license that can be found in the LICENSE file. */
+
 /******************************************************
   home page
 ******************************************************/
@@ -91,7 +95,7 @@
     z-index: 0;
 
     > img {
-      max-height: 240px; // effective max-heigh: 240 * 1.25 = 300px, 75% of two cards total height.
+      max-height: 240px; // effective max-height: 240 * 1.25 = 300px, 75% of two cards total height.
     }
   }
 
diff --git a/pkg/web_css/lib/src/_scores.scss b/pkg/web_css/lib/src/_scores.scss
index aa132fd0c2..8c3c1eabd1 100644
--- a/pkg/web_css/lib/src/_scores.scss
+++ b/pkg/web_css/lib/src/_scores.scss
@@ -75,7 +75,7 @@
     white-space: nowrap;
 
     @media (min-width: $device-desktop-min-width) {
-      font-size: 12x;
+      font-size: 12px;
       letter-spacing: 0.2px;
     }
 
diff --git a/pkg/web_css/lib/src/_search.scss b/pkg/web_css/lib/src/_search.scss
index 5b9693a37b..c32d12f6a2 100644
--- a/pkg/web_css/lib/src/_search.scss
+++ b/pkg/web_css/lib/src/_search.scss
@@ -25,8 +25,6 @@
     border: none;
     border-radius: 24px;
     width: 150px;
-    -webkit-box-flex: 1;
-    -ms-flex-positive: 1;
     flex-grow: 1;
     background: var(--pub-searchbar_input-background-color);
     color: var(--pub-searchbar_input-text-color);
diff --git a/pkg/web_css/lib/src/_variables.scss b/pkg/web_css/lib/src/_variables.scss
index 6999663494..8cfc208c0c 100644
--- a/pkg/web_css/lib/src/_variables.scss
+++ b/pkg/web_css/lib/src/_variables.scss
@@ -1,3 +1,7 @@
+/* Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+   for details. All rights reserved. Use of this source code is governed by a
+   BSD-style license that can be found in the LICENSE file. */
+
 // suggested naming convention:
 //
 // color definitions:
diff --git a/pkg/web_css/lib/style.scss b/pkg/web_css/lib/style.scss
index d369fd1d6a..50ee03d42a 100644
--- a/pkg/web_css/lib/style.scss
+++ b/pkg/web_css/lib/style.scss
@@ -1,3 +1,7 @@
+/* Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+   for details. All rights reserved. Use of this source code is governed by a
+   BSD-style license that can be found in the LICENSE file. */
+
 // Include third-party CSS into a single output file
 // to reduce the number of HTTP requests.
 @use '../../../third_party/css/github-markdown.css';
diff --git a/pkg/web_css/pubspec.yaml b/pkg/web_css/pubspec.yaml
index a232355d16..d008ce8c16 100644
--- a/pkg/web_css/pubspec.yaml
+++ b/pkg/web_css/pubspec.yaml
@@ -6,7 +6,7 @@ environment:
 resolution: workspace
 
 dependencies:
-  sass: ^1.32.8
+  sass: ^1.81.1
 
 dev_dependencies:
   csslib: ^1.0.0
diff --git a/pubspec.lock b/pubspec.lock
index 42b81d2e63..18abcfc229 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -186,10 +186,10 @@ packages:
     dependency: transitive
     description:
       name: cli_pkg
-      sha256: f812467b5d6a5f26ad0fba5dcfc95133df02edbae47dfa4ade3df5d2b5afdcf2
+      sha256: f07db5590796444efdfdc7549e596949b74ce2b707c6a2dfd1f9d841d8337dd4
       url: "https://pub.dev"
     source: hosted
-    version: "2.10.0"
+    version: "2.11.0"
   cli_repl:
     dependency: transitive
     description:
@@ -722,10 +722,10 @@ packages:
     dependency: transitive
     description:
       name: sass
-      sha256: e656cc9f827c236b6b043232cd9b8b5a1d2094e9f01a49936aeccc50d2e871a2
+      sha256: "21ba7cdfd759d0fce641a24052fe9a2d7dff89bf8c56f64a4b9e1f67727db6af"
       url: "https://pub.dev"
     source: hosted
-    version: "1.78.0"
+    version: "1.81.1"
   shelf:
     dependency: transitive
     description: