diff --git a/avenger-vega/src/marks/group.rs b/avenger-vega/src/marks/group.rs
index 6e8aa72..93fe74f 100644
--- a/avenger-vega/src/marks/group.rs
+++ b/avenger-vega/src/marks/group.rs
@@ -3,6 +3,8 @@ use crate::marks::mark::{VegaMark, VegaMarkItem};
 use avenger::marks::group::{GroupBounds, SceneGroup};
 use avenger::marks::mark::SceneMark;
 use serde::{Deserialize, Serialize};
+use avenger::marks::value::{Gradient};
+use crate::marks::values::CssColorOrGradient;
 
 #[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct VegaGroupItem {
@@ -11,8 +13,18 @@ pub struct VegaGroupItem {
     pub(crate) x: f32,
     #[serde(default)]
     pub(crate) y: f32,
+    pub name: Option<String>,
     pub width: Option<f32>,
     pub height: Option<f32>,
+    pub fill: Option<CssColorOrGradient>,
+    pub stroke: Option<CssColorOrGradient>,
+    pub stroke_width: Option<f32>,
+    pub corner_radius: Option<f32>,
+    pub opacity: Option<f32>,
+    pub fill_opacity: Option<f32>,
+    pub stroke_opacity: Option<f32>,
+    pub stroke_offset: Option<f32>,
+    pub zindex: Option<i32>,
 }
 
 impl VegaMarkItem for VegaGroupItem {}
@@ -63,7 +75,23 @@ impl VegaGroupItem {
             };
             marks.extend(item_marks);
         }
+
+        let mut gradients = Vec::<Gradient>::new();
+        let fill = if let Some(v) = &self.fill {
+            let opacity = self.fill_opacity.unwrap_or(1.0) * self.opacity.unwrap_or(1.0);
+            Some(v.to_color_or_grad(opacity, &mut gradients)?)
+        } else {
+            None
+        };
+        let stroke = if let Some(v) = &self.stroke {
+            let opacity = self.fill_opacity.unwrap_or(1.0) * self.opacity.unwrap_or(1.0);
+            Some(v.to_color_or_grad(opacity, &mut gradients)?)
+        } else {
+            None
+        };
+
         Ok(SceneGroup {
+            name: self.name.clone().unwrap_or_else(|| "group_item".to_string()),
             bounds: GroupBounds {
                 x: self.x,
                 y: self.y,
@@ -71,6 +99,12 @@ impl VegaGroupItem {
                 height: self.height,
             },
             marks,
+            gradients,
+            fill,
+            stroke,
+            stroke_width: self.stroke_width,
+            stroke_offset: self.stroke_offset,
+            corner_radius: self.corner_radius,
         })
     }
 }
diff --git a/avenger-vega/src/marks/symbol.rs b/avenger-vega/src/marks/symbol.rs
index 2b7a39b..a33db10 100644
--- a/avenger-vega/src/marks/symbol.rs
+++ b/avenger-vega/src/marks/symbol.rs
@@ -82,6 +82,7 @@ impl VegaMarkContainer<VegaSymbolItem> {
                 line_marks.push(SceneMark::Line(mark));
             }
             return Ok(SceneMark::Group(SceneGroup {
+                name: "symbol_line_legend".to_string(),
                 bounds: GroupBounds {
                     x: 0.0,
                     y: 0.0,
@@ -89,6 +90,12 @@ impl VegaMarkContainer<VegaSymbolItem> {
                     height: None,
                 },
                 marks: line_marks,
+                gradients: vec![],
+                fill: None,
+                stroke: None,
+                stroke_width: None,
+                stroke_offset: None,
+                corner_radius: None,
             }));
         }
 
diff --git a/avenger-wgpu/src/canvas.rs b/avenger-wgpu/src/canvas.rs
index 8ba0aa0..0aba5ab 100644
--- a/avenger-wgpu/src/canvas.rs
+++ b/avenger-wgpu/src/canvas.rs
@@ -267,6 +267,11 @@ pub trait Canvas {
         group: &SceneGroup,
         group_bounds: GroupBounds,
     ) -> Result<(), Sg2dWgpuError> {
+        // Maybe add rect around group boundary
+        if let Some(rect) = group.make_rect() {
+            self.add_rect_mark(&rect, group_bounds)?;
+        }
+
         // Compute new group bounds
         let group_bounds = GroupBounds {
             x: group_bounds.x + group.bounds.x,
diff --git a/avenger/src/marks/group.rs b/avenger/src/marks/group.rs
index 7b17738..481b99b 100644
--- a/avenger/src/marks/group.rs
+++ b/avenger/src/marks/group.rs
@@ -1,5 +1,7 @@
 use crate::marks::mark::SceneMark;
 use serde::{Deserialize, Serialize};
+use crate::marks::rect::RectMark;
+use crate::marks::value::{ColorOrGradient, EncodingValue, Gradient};
 
 #[derive(Debug, Clone, Copy, Serialize, Deserialize)]
 pub struct GroupBounds {
@@ -22,6 +24,47 @@ impl Default for GroupBounds {
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct SceneGroup {
+    pub name: String,
     pub bounds: GroupBounds,
     pub marks: Vec<SceneMark>,
+    pub gradients: Vec<Gradient>,
+    pub fill: Option<ColorOrGradient>,
+    pub stroke: Option<ColorOrGradient>,
+    pub stroke_width: Option<f32>,
+    pub stroke_offset: Option<f32>,
+    pub corner_radius: Option<f32>,
 }
+
+impl SceneGroup {
+    pub fn make_rect(&self) -> Option<RectMark> {
+        if self.fill.is_none() && self.stroke.is_none() {
+            return None
+        }
+        let stroke_width = self.stroke_width.unwrap_or(if self.stroke.is_some() { 1.0 } else { 0.0 });
+        let stroke_offset = if let Some(stroke_offset) = self.stroke_offset {
+            stroke_offset
+        } else {
+            // From Vega's default stroke offset logic
+            if (self.stroke.is_some() && stroke_width > 0.5 && stroke_width < 1.5) {
+                0.5 - (stroke_width - 1.0).abs()
+            } else {
+                0.0
+            }
+        };
+        Some(RectMark {
+            name: format!("rect_{}", self.name),
+            clip: false,
+            len: 1,
+            gradients: self.gradients.clone(),
+            x: EncodingValue::Scalar { value: self.bounds.x + stroke_offset },
+            y: EncodingValue::Scalar { value: self.bounds.y + stroke_offset },
+            width: EncodingValue::Scalar { value: self.bounds.width.unwrap_or(0.0) },
+            height: EncodingValue::Scalar { value: self.bounds.height.unwrap_or(0.0) },
+            fill: EncodingValue::Scalar {value: self.fill.clone().unwrap_or(ColorOrGradient::Color([0.0, 0.0, 0.0, 0.0]))},
+            stroke: EncodingValue::Scalar {value: self.stroke.clone().unwrap_or(ColorOrGradient::Color([0.0, 0.0, 0.0, 0.0]))},
+            stroke_width: EncodingValue::Scalar { value: stroke_width },
+            corner_radius: EncodingValue::Scalar { value: self.corner_radius.unwrap_or(0.0) },
+            indices: None,
+        })
+    }
+}
\ No newline at end of file