diff --git a/RELEASE.md b/RELEASE.md
index 7d582894..a00bd98d 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -109,4 +109,4 @@ Here is a summary of the steps to cut a new release:
 
 If the package is not on conda forge yet, check the documentation to learn how to add it: https://conda-forge.org/docs/maintainer/adding_pkgs.html
 
-Otherwise a bot should pick up the new version publish to PyPI, and open a new PR on the feedstock repository automatically.
\ No newline at end of file
+Otherwise a bot should pick up the new version publish to PyPI, and open a new PR on the feedstock repository automatically.
diff --git a/packages/nbdime/src/common/collapsible.css b/packages/nbdime/src/common/collapsible.css
index 1e3501d9..032b13bd 100644
--- a/packages/nbdime/src/common/collapsible.css
+++ b/packages/nbdime/src/common/collapsible.css
@@ -50,10 +50,18 @@ button.jp-CollapsiblePanel-header-icon:active {
   height: 100%;
 
   /* only transition on transform properties which are hardware accelerated = way better performances */
-  -webkit-transition: -webkit-transform 0.3s ease, height 0.3s;
-  -moz-transition: -moz-transform 0.3s ease, height 0.3s;
-  -ms-transition: -ms-transform 0.3s ease, height 0.3s;
-  transition: transform 0.3s ease, height 0.3s;
+  -webkit-transition:
+    -webkit-transform 0.3s ease,
+    height 0.3s;
+  -moz-transition:
+    -moz-transform 0.3s ease,
+    height 0.3s;
+  -ms-transition:
+    -ms-transform 0.3s ease,
+    height 0.3s;
+  transition:
+    transform 0.3s ease,
+    height 0.3s;
 }
 
 .jp-CollapsiblePanel-opened {
diff --git a/packages/nbdime/src/common/dragpanel.css b/packages/nbdime/src/common/dragpanel.css
index c180f2c5..556cb4c7 100644
--- a/packages/nbdime/src/common/dragpanel.css
+++ b/packages/nbdime/src/common/dragpanel.css
@@ -5,7 +5,8 @@
 |----------------------------------------------------------------------------*/
 
 .jp-DragPanel-dragHandle {
-  background: radial-gradient(rgba(255, 255, 255, 0.6) 30%, transparent 31%) 0 0,
+  background:
+    radial-gradient(rgba(255, 255, 255, 0.6) 30%, transparent 31%) 0 0,
     radial-gradient(transparent 19%, rgba(0, 0, 0, 0.4) 20%, transparent 50%) 0
       1px;
   background-size: 6px 6px;
@@ -19,4 +20,4 @@
 .lm-mod-drag-image {
   left: 0px;
   top: 0px;
-}
\ No newline at end of file
+}
diff --git a/packages/nbdime/src/common/mergeview.ts b/packages/nbdime/src/common/mergeview.ts
index 5a5c7d55..221d78a2 100644
--- a/packages/nbdime/src/common/mergeview.ts
+++ b/packages/nbdime/src/common/mergeview.ts
@@ -143,7 +143,7 @@ const baseTheme = EditorView.baseTheme({
     border: 'var(--jp-border-width) solid var(--jp-border-color1)',
     fontSize: '90%',
     padding: '0 3px',
-    borderRadius: '4px'
+    borderRadius: '4px',
   },
 });
 
diff --git a/packages/nbdime/src/styles/merge.css b/packages/nbdime/src/styles/merge.css
index 906e4066..566d78ce 100644
--- a/packages/nbdime/src/styles/merge.css
+++ b/packages/nbdime/src/styles/merge.css
@@ -227,12 +227,14 @@
 }
 
 .jp-Notebook-merge .cm-merge-m-chunk-start-either::before,
-.jp-Notebook-merge .cm-merge-m-chunk-start-mixed:not(.cm-merge-m-chunk-custom)::before {
+.jp-Notebook-merge
+  .cm-merge-m-chunk-start-mixed:not(.cm-merge-m-chunk-custom)::before {
   border-top: 1px solid var(--jp-merge-either-color1);
 }
 
 .jp-Notebook-merge .cm-merge-m-chunk-end-either::after,
-.jp-Notebook-merge .cm-merge-m-chunk-end-mixed:not(.cm-merge-m-chunk-custom)::after {
+.jp-Notebook-merge
+  .cm-merge-m-chunk-end-mixed:not(.cm-merge-m-chunk-custom)::after {
   border-bottom: 1px solid var(--jp-merge-either-color1);
 }
 
diff --git a/ui-tests/tests/nbdime-merge-test1.spec.ts b/ui-tests/tests/nbdime-merge-test1.spec.ts
index f2e78392..0935cd33 100644
--- a/ui-tests/tests/nbdime-merge-test1.spec.ts
+++ b/ui-tests/tests/nbdime-merge-test1.spec.ts
@@ -27,7 +27,7 @@ test.describe('merge test1', () => {
   test('choose left version for conflict', async ({ page }) => {
     await page
       .locator('.cm-merge-left-editor')
-      .nth(1)  // This select the cell; 0 being the notebook metadata
+      .nth(1) // This select the cell; 0 being the notebook metadata
       .locator('.jp-Merge-gutter-picker')
       .last()
       .click();
@@ -38,7 +38,7 @@ test.describe('merge test1', () => {
   test('choose central version for conflict', async ({ page }) => {
     await page
       .locator('.cm-central-editor')
-      .nth(1)  // This select the cell; 0 being the notebook metadata
+      .nth(1) // This select the cell; 0 being the notebook metadata
       .locator('.jp-Merge-gutter-picker')
       .nth(2)
       .click();
@@ -49,7 +49,7 @@ test.describe('merge test1', () => {
   test('choose right version for conflict', async ({ page }) => {
     await page
       .locator('.cm-merge-right-editor')
-      .nth(1)  // This select the cell; 0 being the notebook metadata
+      .nth(1) // This select the cell; 0 being the notebook metadata
       .locator('.jp-Merge-gutter-picker')
       .last()
       .click();
diff --git a/ui-tests/tests/nbdime-merge-test2.spec.ts b/ui-tests/tests/nbdime-merge-test2.spec.ts
index cf3d3704..b8b77976 100644
--- a/ui-tests/tests/nbdime-merge-test2.spec.ts
+++ b/ui-tests/tests/nbdime-merge-test2.spec.ts
@@ -18,7 +18,7 @@ test.describe('merge test2 ', () => {
   test('choose left version', async ({ page }) => {
     await page
       .locator('.cm-merge-left-editor')
-      .nth(1)  // This select the cell; 0 being the notebook metadata
+      .nth(1) // This select the cell; 0 being the notebook metadata
       .locator('.jp-Merge-gutter-picker')
       .last()
       .click();
@@ -28,7 +28,7 @@ test.describe('merge test2 ', () => {
   test('choose central version', async ({ page }) => {
     await page
       .locator('.cm-central-editor')
-      .nth(1)  // This select the cell; 0 being the notebook metadata
+      .nth(1) // This select the cell; 0 being the notebook metadata
       .locator('.jp-Merge-gutter-picker')
       .nth(2)
       .click();
@@ -38,7 +38,7 @@ test.describe('merge test2 ', () => {
   test('choose right version', async ({ page }) => {
     await page
       .locator('.cm-merge-right-editor')
-      .nth(1)  // This select the cell; 0 being the notebook metadata
+      .nth(1) // This select the cell; 0 being the notebook metadata
       .locator('.jp-Merge-gutter-picker')
       .last()
       .click();
diff --git a/ui-tests/tests/nbdime-merge-test6.spec.ts b/ui-tests/tests/nbdime-merge-test6.spec.ts
index 28a41bfe..7fd2841c 100644
--- a/ui-tests/tests/nbdime-merge-test6.spec.ts
+++ b/ui-tests/tests/nbdime-merge-test6.spec.ts
@@ -10,7 +10,7 @@ test.describe('merge test6', () => {
   });
 
   test('take a snapshot at opening', async ({ page }) => {
-    await page.getByText('Hide unchanged cells').click()
+    await page.getByText('Hide unchanged cells').click();
     await page.getByText('a = "hello the world"').waitFor();
     // Check that single editor are not collapsed; added cell and unchanged cell
     expect.soft(await page.locator('#main').screenshot()).toMatchSnapshot();