added column width options

src/diagram.typ

@@ -18,6 +18,17 @@
   ),)
 }
 
+#let _col(p1, p2, width: auto, margin: 0, min-width: 0) = {
+  return ((
+    type: "col",
+    p1: p1,
+    p2: p2,
+    width: width,
+    margin: margin,
+    min-width: min-width
+  ),)
+}
+
 #let diagram(elements, width: auto) = {
   if elements == none {
     return