diff --git a/src/textual/_compositor.py b/src/textual/_compositor.py
index 0432631fc..0f8ebc944 100644
--- a/src/textual/_compositor.py
+++ b/src/textual/_compositor.py
@@ -519,9 +519,10 @@ class Compositor:
         """
 
         contains = Region.contains
-        for widget, cropped_region, region in self.layers_visible[y]:
-            if contains(cropped_region, x, y) and widget.visible:
-                return widget, region
+        if len(self.layers_visible) > y >= 0:
+            for widget, cropped_region, region in self.layers_visible[y]:
+                if contains(cropped_region, x, y) and widget.visible:
+                    return widget, region
         raise errors.NoWidget(f"No widget under screen coordinate ({x}, {y})")
 
     def get_widgets_at(self, x: int, y: int) -> Iterable[tuple[Widget, Region]]:
diff --git a/src/textual/scroll_view.py b/src/textual/scroll_view.py
index 03b02a4c2..416722874 100644
--- a/src/textual/scroll_view.py
+++ b/src/textual/scroll_view.py
@@ -76,7 +76,7 @@ class ScrollView(Widget):
             self._size = size
             virtual_size = self.virtual_size
             self._scroll_update(virtual_size)
-            self._container_size = size - self.gutter.totals
+            self._container_size = size
             self.scroll_to(self.scroll_x, self.scroll_y, animate=False)
             self.refresh()
 
diff --git a/src/textual/widget.py b/src/textual/widget.py
index b6cfd79b6..8746bba5b 100644
--- a/src/textual/widget.py
+++ b/src/textual/widget.py
@@ -1680,21 +1680,22 @@ class Widget(DOMNode):
         return lines
 
     def get_style_at(self, x: int, y: int) -> Style:
-        """Get the Rich style at a given screen offset.
+        """Get the Rich style in a widget at a given relative offset.
 
         Args:
-            x (int): X coordinate relative to the screen.
-            y (int): Y coordinate relative to the screen.
+            x (int): X coordinate relative to the widget.
+            y (int): Y coordinate relative to the widget.
 
         Returns:
             Style: A rich Style object.
         """
-        widget, region = self.screen.get_widget_at(x, y)
+        offset = Offset(x, y)
+        screen_offset = offset + self.region.offset
+
+        widget, _ = self.screen.get_widget_at(*screen_offset)
         if widget is not self:
             return Style()
-        offset_x, offset_y = region.offset
-        # offset_x, offset_y = self.screen.get_offset(self)
-        return self.screen.get_style_at(x + offset_x, y + offset_y)
+        return self.screen.get_style_at(*screen_offset)
 
     async def _forward_event(self, event: events.Event) -> None:
         event._set_forwarded()