diff --git a/examples/basic.py b/examples/basic.py
index d9a20e989..965332876 100644
--- a/examples/basic.py
+++ b/examples/basic.py
@@ -15,11 +15,17 @@ class BasicApp(App):
 
     #sidebar {
         text: bold #09312e on #3CAEA3;
-        /* dock-group: header; */
+        dock-group: side;
         width: 30;
         height: 1fr;
         layer: panels;
         border-right: vkey #09312e;
+        display: block;
+        offset-x: -15
+    }
+
+    #sidebar.-active {
+        display: block;
     }
 
     #header {
@@ -27,7 +33,6 @@ class BasicApp(App):
         dock-group: header;
         height: 3;
         border: hkey white;
-
     }
 
     #footer {
@@ -45,6 +50,9 @@ class BasicApp(App):
 
     """
 
+    async def on_load(self) -> None:
+        await self.bind("t", "toggle('#sidebar', '-active')")
+
     async def on_mount(self) -> None:
         """Build layout here."""
 
diff --git a/src/textual/app.py b/src/textual/app.py
index ff068226f..6440b1e37 100644
--- a/src/textual/app.py
+++ b/src/textual/app.py
@@ -572,6 +572,9 @@ class App(DOMNode):
     async def action_bell(self) -> None:
         self.console.bell()
 
+    async def action_toggle(self, selector: str, class_name: str) -> None:
+        self.view.query(selector).toggle_class(class_name)
+
 
 if __name__ == "__main__":
     import asyncio
diff --git a/src/textual/css/_styles_builder.py b/src/textual/css/_styles_builder.py
index e05682394..4ac470897 100644
--- a/src/textual/css/_styles_builder.py
+++ b/src/textual/css/_styles_builder.py
@@ -57,7 +57,8 @@ class StylesBuilder:
 
     def process_display(self, name: str, tokens: list[Token]) -> None:
         for token in tokens:
-            _, _, location, name, value = token
+            name, value, _, _, location = token
+
             if name == "token":
                 value = value.lower()
                 if value in VALID_DISPLAY:
diff --git a/src/textual/css/query.py b/src/textual/css/query.py
index 7d4c65d24..9081b9efb 100644
--- a/src/textual/css/query.py
+++ b/src/textual/css/query.py
@@ -11,7 +11,6 @@ from .parse import parse_selectors
 
 if TYPE_CHECKING:
     from ..dom import DOMNode
-    from ..widget import Widget
 
 
 @rich.repr.auto(angular=True)
@@ -65,5 +64,6 @@ class DOMQuery:
             node.remove_class(*class_names)
 
     def toggle_class(self, *class_names: str) -> None:
+
         for node in self._nodes:
             node.remove_class(*class_names)
diff --git a/src/textual/css/tokenize.py b/src/textual/css/tokenize.py
index 146b9faf8..b5912398b 100644
--- a/src/textual/css/tokenize.py
+++ b/src/textual/css/tokenize.py
@@ -45,7 +45,7 @@ expect_declaration_content = Expect(
     whitespace=r"\s+",
     comment_start=r"\/\*",
     percentage=r"\d+\%",
-    scalar=r"\d+\.?\d*(?:fr|%)?",
+    scalar=r"\-?\d+\.?\d*(?:fr|%)?",
     color=r"\#[0-9a-fA-F]{6}|color\([0-9]{1,3}\)|rgb\(\d{1,3}\,\s?\d{1,3}\,\s?\d{1,3}\)",
     key_value=r"[a-zA-Z_-][a-zA-Z0-9_-]*=[0-9a-zA-Z_\-\/]+",
     token="[a-zA-Z_-]+",
diff --git a/src/textual/widget.py b/src/textual/widget.py
index e46bc66a5..355c2d3cd 100644
--- a/src/textual/widget.py
+++ b/src/textual/widget.py
@@ -77,12 +77,12 @@ class Widget(DOMNode):
 
         super().__init__(name=name, id=id)
 
-    visible: Reactive[bool] = Reactive(True, layout=True)
+    # visible: Reactive[bool] = Reactive(True, layout=True)
     layout_size: Reactive[int | None] = Reactive(None, layout=True)
     layout_fraction: Reactive[int] = Reactive(1, layout=True)
     layout_min_size: Reactive[int] = Reactive(1, layout=True)
-    layout_offset_x: Reactive[float] = Reactive(0.0, layout=True)
-    layout_offset_y: Reactive[float] = Reactive(0.0, layout=True)
+    # layout_offset_x: Reactive[float] = Reactive(0.0, layout=True)
+    # layout_offset_y: Reactive[float] = Reactive(0.0, layout=True)
 
     style: Reactive[str | None] = Reactive(None)
     padding: Reactive[Spacing | None] = Reactive(None, layout=True)
@@ -97,11 +97,11 @@ class Widget(DOMNode):
     def validate_margin(self, margin: SpacingDimensions) -> Spacing:
         return Spacing.unpack(margin)
 
-    def validate_layout_offset_x(self, value) -> int:
-        return int(value)
+    # def validate_layout_offset_x(self, value) -> int:
+    #     return int(value)
 
-    def validate_layout_offset_y(self, value) -> int:
-        return int(value)
+    # def validate_layout_offset_y(self, value) -> int:
+    #     return int(value)
 
     def __init_subclass__(cls, can_focus: bool = True) -> None:
         super().__init_subclass__()
@@ -144,21 +144,15 @@ class Widget(DOMNode):
         if styles.has_border:
             renderable = Border(renderable, styles.border)
 
-            # _border_style = self.console.get_style(self.border_style)
-            # renderable = Border(
-            #     renderable,
-            #     (
-            #         ("heavy", _border_style),
-            #         ("heavy", _border_style),
-            #         ("heavy", _border_style),
-            #         ("heavy", _border_style),
-            #     ),
-            # )
         if self.margin is not None:
             renderable = Padding(renderable, self.margin)
         renderable = Styled(renderable, styles.text)
         return renderable
 
+    @property
+    def visible(self) -> bool:
+        return self.styles.display == "block"
+
     @property
     def size(self) -> Size:
         return self._size
@@ -187,7 +181,8 @@ class Widget(DOMNode):
     @property
     def layout_offset(self) -> tuple[int, int]:
         """Get the layout offset as a tuple."""
-        return (round(self.layout_offset_x), round(self.layout_offset_y))
+        x, y = self.styles.offset
+        return round(x), round(y)
 
     @property
     def gutter(self) -> Spacing: