diff --git a/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
index c8946cab..a75f9ae8 100644
--- a/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
+++ b/B07_DesignDetail/openwebcad/src/drawControllers/screenCanvas.drawController.ts
@@ -647,7 +647,11 @@ export class ScreenCanvasDrawController implements DrawController {
 		if (this.batching) this.flushBatch();
 		// TODO see if we need to replace this with a call to fillPolygon
 		this.context.fillStyle = paintColor(color);
-		this.context.fillRect(xMin, this.canvasSize.y - yMin, width, height);
+		// 화면 좌표는 아래에서 위로 재는 규약이다(getCanvasPoint·drawLineScreen과 같다).
+		// yMin은 사각형의 아래 변이므로 캔버스 y로 옮길 때 높이를 함께 빼야 제자리다.
+		// 안 빼서 선택 그립이 선보다 8px 아래에 찍혔고, 줌을 해도 화면 픽셀 어긋남이라
+		// 간격이 그대로였다(2026-08-30 사용자 지적).
+		this.context.fillRect(xMin, this.canvasSize.y - yMin - height, width, height);
 	}
 
 	/**
diff --git a/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts b/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts
index 2ec21f69..308ace26 100644
--- a/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts
+++ b/B07_DesignDetail/openwebcad/src/inputController/input-controller.ts
@@ -126,7 +126,9 @@ export class InputController {
 		// draw input field
 		drawController.fillRectScreen(
 			screenMouseLocation.x + CANVAS_INPUT_FIELD_MOUSE_OFFSET,
-			screenMouseLocation.y - CANVAS_INPUT_FIELD_MOUSE_OFFSET,
+			// fillRectScreen이 아래 변 기준으로 바로잡혔으므로, 칸이 있던 자리를 지키려고
+			// 높이만큼 내려 잡는다.
+			screenMouseLocation.y - CANVAS_INPUT_FIELD_MOUSE_OFFSET - CANVAS_INPUT_FIELD_HEIGHT,
 			CANVAS_INPUT_FIELD_WIDTH,
 			CANVAS_INPUT_FIELD_HEIGHT,
 			CANVAS_INPUT_FIELD_BACKGROUND_COLOR