quick edit for the effect. using 2bwm's border code

2bforbspwm.patch

diff -ruN a/tree.c b/tree.c
--- a/tree.c	2022-07-30 17:23:37.210497524 -0400
+++ b/tree.c	2022-07-30 17:20:21.036916013 -0400
@@ -132,12 +132,14 @@
 
 		if (!rect_eq(r, cr)) {
 			window_move_resize(n->id, r.x, r.y, r.width, r.height);
+
 			if (!grabbing) {
 				put_status(SBSC_MASK_NODE_GEOMETRY, "node_geometry 0x%08X 0x%08X 0x%08X %ux%u+%i+%i\n", m->id, d->id, n->id, r.width, r.height, r.x, r.y);
 			}
 		}
 
 		window_border_width(n->id, bw);
+        window_draw_border(n->id, get_border_color((n == d->focus), (m == mon)));
 
 	} else {
 		xcb_rectangle_t first_rect;
diff -ruN a/window.c b/window.c
--- a/window.c	2022-07-30 17:23:37.210497524 -0400
+++ b/window.c	2022-07-30 17:20:21.037916057 -0400
@@ -418,7 +418,77 @@
 
 void window_draw_border(xcb_window_t win, uint32_t border_color_pxl)
 {
-	xcb_change_window_attributes(dpy, win, XCB_CW_BORDER_PIXEL, &border_color_pxl);
+    uint32_t values[1];
+    uint16_t half = 0;
+    xcb_get_geometry_reply_t *geo = xcb_get_geometry_reply(dpy, xcb_get_geometry(dpy, win), NULL);
+    if (geo == NULL) return;
+
+    //hardcoded
+    half = 6;
+
+	uint16_t w  = geo->width;
+	uint16_t h  = geo->height;
+	uint16_t bw = geo->border_width;
+    uint16_t depth = geo->depth;
+
+    xcb_rectangle_t rect_inner[] = {
+		{
+			w,0,bw - half,h + bw - half
+		},
+		{
+			w + bw + half,0,bw - half,h + bw - half
+		},
+		{
+			0,h,w + bw - half,bw - half
+		},
+		{
+			0,h + bw + half,w + bw - half,bw - half
+		},
+		{
+			w + bw + half,bw + h + half,bw,	bw
+		}
+	};
+
+	xcb_rectangle_t rect_outer[] = {
+		{
+			w + bw - half,0,half, h + bw * 2
+		},
+		{
+			w + bw,0,half,h + bw * 2
+		},
+		{
+			0,h + bw - half,w + bw * 2,half
+		},
+		{
+			0,h + bw,w + bw * 2,half
+		},
+		{
+			1,1,1,1
+		}
+	};
+
+    xcb_pixmap_t pmap = xcb_generate_id(dpy);
+    xcb_create_pixmap(dpy, depth, pmap, win,w + (bw * 2),h + (bw * 2));
+
+    xcb_gcontext_t gc = xcb_generate_id(dpy);
+    xcb_create_gc(dpy, gc, pmap, 0, NULL);
+
+    //hardcoded
+    values[0] = 0xff0000;
+
+    xcb_change_gc(dpy, gc, XCB_GC_FOREGROUND, &values[0]);
+    xcb_poly_fill_rectangle(dpy, pmap, gc, 5, rect_outer);
+
+    values[0] = border_color_pxl;
+
+    xcb_change_gc(dpy, gc, XCB_GC_FOREGROUND, &values[0]);
+    xcb_poly_fill_rectangle(dpy, pmap, gc, 5, rect_inner);
+    values[0] = pmap;
+    xcb_change_window_attributes(dpy,win, XCB_CW_BORDER_PIXMAP,&values[0]);
+
+    xcb_free_pixmap(dpy,pmap);
+    xcb_free_gc(dpy,gc);
+    xcb_flush(dpy);
 }
 
 void adopt_orphans(void)
@@ -618,6 +688,7 @@
 		n->client->floating_rectangle = (xcb_rectangle_t) {x, y, width, height};
 		if (n->client->state == STATE_FLOATING) {
 			window_move_resize(n->id, x, y, width, height);
+            window_draw_border(n->id, get_border_color(loc->monitor = mon, loc->node = mon->desk->focus));
 
 			if (!grabbing) {
 				put_status(SBSC_MASK_NODE_GEOMETRY, "node_geometry 0x%08X 0x%08X 0x%08X %ux%u+%i+%i\n", loc->monitor->id, loc->desktop->id, loc->node->id, width, height, x, y);