diff --git a/B07_DesignDetail/openwebcad/src/App.css b/B07_DesignDetail/openwebcad/src/App.css
index ef48df68..264f6190 100644
--- a/B07_DesignDetail/openwebcad/src/App.css
+++ b/B07_DesignDetail/openwebcad/src/App.css
@@ -211,14 +211,15 @@ body > canvas[data-id="canvas"] {
 	color: var(--cad-accent);
 }
 .cad-ribbon-overflow {
-	position: absolute;
-	z-index: 10;
-	top: 100%;
-	left: 4px;
+	/* 리본 패널 줄이 가로 스크롤 상자라 그 안에서는 잘린다 — 화면 좌표로 띄운다 */
+	position: fixed;
+	z-index: 20;
 	display: flex;
 	flex-direction: column;
 	min-width: 170px;
+	max-height: 72vh;
 	padding: 4px;
+	overflow-y: auto;
 	background: var(--cad-chrome-raised);
 	border: 1px solid var(--cad-line);
 	border-radius: 4px;
diff --git a/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx b/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx
index cbf9ad42..57fe1f00 100644
--- a/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx
+++ b/B07_DesignDetail/openwebcad/src/ribbon/Ribbon.tsx
@@ -1,11 +1,11 @@
 /** 리본 렌더러 — ribbon.config.ts의 데이터와 명령 레지스트리만 보고 그린다. */
-import { type FC, type ReactNode, useState } from 'react';
-import { getActiveRibbonTab, setActiveRibbonTab } from '../components/ui-state';
+import { type FC, type ReactNode, useEffect, useRef, useState } from 'react';
 import type { CadCommand } from '../commands/command.types';
 import { getCommandById } from '../commands/registry';
 import { runCommand } from '../commands/run-command';
-import { type RibbonPanel, RIBBON_TABS, type RibbonWidget } from './ribbon.config';
+import { getActiveRibbonTab, setActiveRibbonTab } from '../components/ui-state';
 import type { Tool } from '../tools';
+import { RIBBON_TABS, type RibbonPanel, type RibbonWidget } from './ribbon.config';
 
 interface RibbonProps {
 	activeTool: Tool | null;
@@ -36,6 +36,9 @@ const CommandButton: FC<CommandButtonProps> = ({ command, size, activeTool, onRu
 	</button>
 );
 
+/** 슬라이드아웃 최소 폭 — 화면 오른쪽으로 넘치지 않게 자리를 잡을 때 쓴다 */
+const OVERFLOW_WIDTH = 170;
+
 const resolve = (ids: string[] | undefined): CadCommand[] =>
 	(ids ?? []).map((id) => getCommandById(id)).filter((command): command is CadCommand => !!command);
 
@@ -45,9 +48,40 @@ const Panel: FC<{
 	widgets: Partial<Record<RibbonWidget, ReactNode>>;
 	onRun: (command: CadCommand) => void;
 }> = ({ panel, activeTool, widgets, onRun }) => {
-	const [overflowOpen, setOverflowOpen] = useState(false);
+	// 패널 슬라이드아웃은 화면 좌표로 띄운다 — 리본 패널 줄이 가로 스크롤 상자라
+	// 그 안에 두면 리본 높이에서 잘려 캔버스에 가린 것처럼 보인다.
+	const labelRef = useRef<HTMLButtonElement>(null);
+	const [overflowAt, setOverflowAt] = useState<{ top: number; left: number } | null>(null);
 	const overflowCommands = resolve(panel.overflow);
 
+	// 캔버스 위에 뜨는 메뉴라 다른 곳을 누르면 닫는다
+	useEffect(() => {
+		if (!overflowAt) return;
+		const close = (event: PointerEvent) => {
+			const target = event.target as Node | null;
+			// 자기 메뉴·자기 라벨만 예외다 — 다른 패널을 누르면 이 메뉴는 닫힌다
+			if (target instanceof HTMLElement && target.closest('.cad-ribbon-overflow')) return;
+			if (target && labelRef.current?.contains(target)) return;
+			setOverflowAt(null);
+		};
+		document.addEventListener('pointerdown', close);
+		return () => document.removeEventListener('pointerdown', close);
+	}, [overflowAt]);
+
+	const toggleOverflow = () => {
+		if (!overflowCommands.length) return;
+		if (overflowAt) {
+			setOverflowAt(null);
+			return;
+		}
+		const rect = labelRef.current?.getBoundingClientRect();
+		if (!rect) return;
+		setOverflowAt({
+			top: rect.bottom + 2,
+			left: Math.max(4, Math.min(rect.left, window.innerWidth - OVERFLOW_WIDTH - 8)),
+		});
+	};
+
 	return (
 		<section className="cad-ribbon-group">
 			<div className="cad-ribbon-tools">
@@ -79,23 +113,24 @@ const Panel: FC<{
 				)}
 			</div>
 			<button
+				ref={labelRef}
 				type="button"
 				className="cad-ribbon-group__label"
 				data-expandable={overflowCommands.length > 0}
-				onClick={() => overflowCommands.length && setOverflowOpen((open) => !open)}
+				onClick={toggleOverflow}
 			>
 				{panel.label}
 				{overflowCommands.length ? ' ▾' : ''}
 			</button>
-			{overflowOpen && overflowCommands.length > 0 && (
-				<div className="cad-ribbon-overflow">
+			{overflowAt && overflowCommands.length > 0 && (
+				<div className="cad-ribbon-overflow" style={{ top: overflowAt.top, left: overflowAt.left }}>
 					{overflowCommands.map((command) => (
 						<button
 							type="button"
 							key={command.id}
 							title={command.hint}
 							onClick={() => {
-								setOverflowOpen(false);
+								setOverflowAt(null);
 								onRun(command);
 							}}
 						>