hopefully avoid creating a tiny scrollbar

Runtime/WebViewComponent.cs

@@ -101,7 +101,7 @@ namespace bessw.Unity.WebView
             if (tab is not null)
             {
                 var size = new Vector2(viewPort.rect.width, viewPort.rect.height) * scaler.scaleFactor;
-                Vector2Int sizeInt = Vector2Int.RoundToInt(size);
+                Vector2Int sizeInt = Vector2Int.FloorToInt(size);
                 if (tab.Size != sizeInt)
                 {
                     _ = tab.SetSize(sizeInt);