fix modal rendering so keyboard shortcuts work on modal as well

src/components/App.tsx

@@ -489,6 +489,7 @@ class App extends React.Component<AppProps, AppState> {
           />
           <div className="excalidraw-textEditorContainer" />
           <div className="excalidraw-contextMenuContainer" />
+          <div className="excalidraw-modal-container" />
           {this.state.showStats && (
             <Stats
               appState={this.state}

src/components/Modal.scss

@@ -1,9 +1,13 @@
 @import "../css/variables.module";
 
 .excalidraw {
-  &.excalidraw-modal-container {
-    position: absolute;
-    z-index: 10;
+  .excalidraw-modal-container {
+    &--visible {
+      position: absolute;
+      z-index: 10;
+      width: 100%;
+      height: 100%;
+    }
   }
 
   .Modal {

src/components/Modal.tsx

@@ -65,20 +65,21 @@ const useBodyRoot = () => {
       .querySelector(".excalidraw")
       ?.classList.contains("theme--dark");
     const div = document.createElement("div");
-
-    div.classList.add("excalidraw", "excalidraw-modal-container");
+    const container = document.querySelector(".excalidraw-modal-container")!;
+    container.classList.add("excalidraw-modal-container--visible");
     div.classList.toggle("excalidraw--mobile", isMobileRef.current);
 
     if (isDarkTheme) {
       div.classList.add("theme--dark");
       div.classList.add("theme--dark-background-none");
     }
-    document.body.appendChild(div);
+    container.appendChild(div);
 
     setDiv(div);
 
     return () => {
-      document.body.removeChild(div);
+      container.classList.remove("excalidraw-modal-container--visible");
+      container!.removeChild(div);
     };
   }, []);