diff --git a/dist/git-code-embed-dark.min.js b/dist/git-code-embed-dark.min.js
index 9c08558..d61a879 100644
--- a/dist/git-code-embed-dark.min.js
+++ b/dist/git-code-embed-dark.min.js
@@ -173,7 +173,7 @@ ${It}
 @supports (scrollbar-color: auto) {
   .gce-container .gce-code-wrap {
     scrollbar-color: var(--gce-scrollbar-thumb) var(--gce-code-bg);
-    scrollbar-width: thin;
+    scrollbar-width: auto;
   }
 }
 
@@ -189,6 +189,7 @@ ${It}
   border-collapse: collapse;
   width: 100%;
   display: table;
+  margin: 0;
 }
 
 .gce-container .gce-table td.gce-lineno {
diff --git a/dist/git-code-embed-light.min.js b/dist/git-code-embed-light.min.js
index d85ae06..49525bb 100644
--- a/dist/git-code-embed-light.min.js
+++ b/dist/git-code-embed-light.min.js
@@ -173,7 +173,7 @@ ${It}
 @supports (scrollbar-color: auto) {
   .gce-container .gce-code-wrap {
     scrollbar-color: var(--gce-scrollbar-thumb) var(--gce-code-bg);
-    scrollbar-width: thin;
+    scrollbar-width: auto;
   }
 }
 
@@ -189,6 +189,7 @@ ${It}
   border-collapse: collapse;
   width: 100%;
   display: table;
+  margin: 0;
 }
 
 .gce-container .gce-table td.gce-lineno {
diff --git a/dist/git-code-embed.min.js b/dist/git-code-embed.min.js
index d51844b..e871018 100644
--- a/dist/git-code-embed.min.js
+++ b/dist/git-code-embed.min.js
@@ -173,7 +173,7 @@ ${It}
 @supports (scrollbar-color: auto) {
   .gce-container .gce-code-wrap {
     scrollbar-color: var(--gce-scrollbar-thumb) var(--gce-code-bg);
-    scrollbar-width: thin;
+    scrollbar-width: auto;
   }
 }
 
@@ -189,6 +189,7 @@ ${It}
   border-collapse: collapse;
   width: 100%;
   display: table;
+  margin: 0;
 }
 
 .gce-container .gce-table td.gce-lineno {
diff --git a/package-lock.json b/package-lock.json
index 1400594..26ee896 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "git-code-embed",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "git-code-embed",
-      "version": "0.2.0",
+      "version": "0.2.1",
       "devDependencies": {
         "@types/node": "^24.12.0",
         "esbuild": "^0.27.3",
diff --git a/package.json b/package.json
index 6e4e7c4..54c5be7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "git-code-embed",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "Embed GitHub code snippets with syntax highlighting in blog posts",
   "main": "dist/git-code-embed.min.js",
   "scripts": {
diff --git a/src/styles.ts b/src/styles.ts
index 5cc759b..3c9695e 100644
--- a/src/styles.ts
+++ b/src/styles.ts
@@ -192,7 +192,7 @@ ${THEME_COLORS}
 @supports (scrollbar-color: auto) {
   .gce-container .gce-code-wrap {
     scrollbar-color: var(--gce-scrollbar-thumb) var(--gce-code-bg);
-    scrollbar-width: thin;
+    scrollbar-width: auto;
   }
 }
 
@@ -208,6 +208,7 @@ ${THEME_COLORS}
   border-collapse: collapse;
   width: 100%;
   display: table;
+  margin: 0;
 }
 
 .gce-container .gce-table td.gce-lineno {
diff --git a/test/styles.test.ts b/test/styles.test.ts
index bd521ff..09fc1b1 100644
--- a/test/styles.test.ts
+++ b/test/styles.test.ts
@@ -175,10 +175,16 @@ describe("CSS (テーマ: light)", () => {
     expect(match![1]).toContain("color: var(--gce-code-text)");
   });
 
+  it(".gce-table に margin: 0 を含む", () => {
+    const match = CSS.match(/\.gce-container \.gce-table \{([^}]*)\}/);
+    expect(match).not.toBeNull();
+    expect(match![1]).toContain("margin: 0");
+  });
+
   it("scrollbar-color サポートブラウザ向けの @supports ブロックを含む", () => {
     expect(CSS).toContain("@supports (scrollbar-color: auto)");
     expect(CSS).toContain("scrollbar-color: var(--gce-scrollbar-thumb) var(--gce-code-bg)");
-    expect(CSS).toContain("scrollbar-width: thin");
+    expect(CSS).toContain("scrollbar-width: auto");
   });
 
   it("scrollbar-color 非対応ブラウザ向けの @supports not ブロックに webkit ルールを含む", () => {