diff --git a/test/visual/default.html b/test/visual/default.html
index 18b9051..f82fcbd 100644
--- a/test/visual/default.html
+++ b/test/visual/default.html
@@ -41,6 +41,13 @@
     </vaadin-checkbox-group>
   </div>
 
+  <div id="theme-vertical-group-tests">
+    <vaadin-checkbox-group label="Choose a number" theme="vertical">
+      <vaadin-checkbox value="1">1</vaadin-checkbox>
+      <vaadin-checkbox value="2">2</vaadin-checkbox>
+    </vaadin-checkbox-group>
+  </div>
+
   <div id="disabled-group-tests">
     <vaadin-checkbox-group label="Choose a number" disabled>
       <vaadin-checkbox value="1">1</vaadin-checkbox>
diff --git a/test/visual/screens/vaadin-checkbox/disabled-group-tests-lumo/default/chrome.png b/test/visual/screens/vaadin-checkbox/disabled-group-tests-lumo/default/chrome.png
index a95c40a..5defe1e 100644
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diff --git a/test/visual/screens/vaadin-checkbox/disabled-group-tests-lumo/default/firefox.png b/test/visual/screens/vaadin-checkbox/disabled-group-tests-lumo/default/firefox.png
index cf609b8..2a75244 100644
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diff --git a/test/visual/screens/vaadin-checkbox/focus-tests-lumo/focus/chrome.png b/test/visual/screens/vaadin-checkbox/focus-tests-lumo/focus/chrome.png
index 3e88ee0..0e75b11 100644
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diff --git a/test/visual/screens/vaadin-checkbox/focus-tests-lumo/focus/firefox.png b/test/visual/screens/vaadin-checkbox/focus-tests-lumo/focus/firefox.png
index c5344b5..230ca93 100644
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diff --git a/test/visual/screens/vaadin-checkbox/theme-vertical-group-tests-lumo/default/chrome.png b/test/visual/screens/vaadin-checkbox/theme-vertical-group-tests-lumo/default/chrome.png
new file mode 100644
index 0000000..250d41b
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diff --git a/test/visual/screens/vaadin-checkbox/theme-vertical-group-tests-lumo/default/firefox.png b/test/visual/screens/vaadin-checkbox/theme-vertical-group-tests-lumo/default/firefox.png
new file mode 100644
index 0000000..3eeed89
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diff --git a/test/visual/screens/vaadin-checkbox/theme-vertical-group-tests-material/default/chrome.png b/test/visual/screens/vaadin-checkbox/theme-vertical-group-tests-material/default/chrome.png
new file mode 100644
index 0000000..fe8afab
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diff --git a/test/visual/screens/vaadin-checkbox/theme-vertical-group-tests-material/default/firefox.png b/test/visual/screens/vaadin-checkbox/theme-vertical-group-tests-material/default/firefox.png
new file mode 100644
index 0000000..1a5803b
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diff --git a/test/visual/screens/vaadin-checkbox/validation-tests-lumo/error/chrome.png b/test/visual/screens/vaadin-checkbox/validation-tests-lumo/error/chrome.png
index 4f2fab4..5bb7fae 100644
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diff --git a/test/visual/screens/vaadin-checkbox/validation-tests-lumo/error/firefox.png b/test/visual/screens/vaadin-checkbox/validation-tests-lumo/error/firefox.png
index d7152d2..800cac1 100644
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diff --git a/test/visual/screens/vaadin-checkbox/wrapping-group-tests-lumo/default/chrome.png b/test/visual/screens/vaadin-checkbox/wrapping-group-tests-lumo/default/chrome.png
index f8b61c2..c8e7590 100644
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diff --git a/test/visual/screens/vaadin-checkbox/wrapping-group-tests-lumo/default/firefox.png b/test/visual/screens/vaadin-checkbox/wrapping-group-tests-lumo/default/firefox.png
index 6dfd84d..2620caa 100644
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diff --git a/test/visual/test.js b/test/visual/test.js
index 2659483..97a6a0a 100644
--- a/test/visual/test.js
+++ b/test/visual/test.js
@@ -39,6 +39,13 @@ gemini.suite('vaadin-checkbox', function(rootSuite) {
         .capture('default');
     });
 
+    gemini.suite(`theme-vertical-group-tests-${theme}`, (suite) => {
+      suite
+        .setUrl(`default.html?theme=${theme}`)
+        .setCaptureElements('#theme-vertical-group-tests')
+        .capture('default');
+    });
+
     gemini.suite(`disabled-group-tests-${theme}`, (suite) => {
       suite
         .setUrl(`default.html?theme=${theme}`)
diff --git a/theme/material/vaadin-checkbox-group-styles.html b/theme/material/vaadin-checkbox-group-styles.html
index 890a274..0079f89 100644
--- a/theme/material/vaadin-checkbox-group-styles.html
+++ b/theme/material/vaadin-checkbox-group-styles.html
@@ -35,7 +35,7 @@
         position: absolute;
       }
 
-      :host([theme~="vertical"]) {
+      :host([theme~="vertical"]) [part="group-field"] {
         display: flex;
         flex-direction: column;
       }