diff --git a/src/core/draw/participant/boundary.typ b/src/core/draw/participant/boundary.typ
index 0c1e5be..91dc486 100644
--- a/src/core/draw/participant/boundary.typ
+++ b/src/core/draw/participant/boundary.typ
@@ -1,22 +1,23 @@
 #import "/src/cetz.typ": draw
 
-#import "/src/core/utils.typ": normalize-measure
-#import "/src/consts.typ": *
+#import "/src/core/utils.typ": normalize-measure, normalize-units
 
 #let name = "boundary"
 
 #let render(x, y, p, bottom) = {
-  let m = measure(p.display-name)
+  let m = normalize-measure(p.display-name)
   let style = p.resolved-style
-  let circle-r = BOUNDARY-HEIGHT / 2
+  let height = normalize-units(style.height)
+  let spacing = normalize-units(style.spacing)
+  let circle-r = height / 2
   let y0 = if bottom {
-    y - m.height / 1pt - SYM-GAP
+    y - m.height - spacing
   } else {
-    y + m.height / 1pt + BOUNDARY-HEIGHT + SYM-GAP
+    y + m.height + height + spacing
   }
-  let x0 = x - BOUNDARY-HEIGHT
+  let x0 = x - height
   let y1 = y0 - circle-r
-  let y2 = y0 - BOUNDARY-HEIGHT
+  let y2 = y0 - height
 
   draw.circle(
     (x + circle-r, y1),
@@ -42,12 +43,17 @@
 #let get-size(par) = {
   let m = normalize-measure(par.display-name)
 
-  // BOUNDARY-HEIGHT * 2pt
-  // BOUNDARY-HEIGHT * 1pt + SYM-GAP * 1pt + h
+  let height = normalize-units(par.resolved-style.height)
+  let width = height * 2
+  let spacing = normalize-units(par.resolved-style.spacing)
 
-  return m
+  return (
+    width: calc.max(m.width, width),
+    height: height + spacing + m.height
+  )
 }
 
 #let default-style = (
-  :
+  height: 20pt,
+  spacing: 5pt
 )
\ No newline at end of file