double ox = c->x, oy = c->y;
		wlr_output_layout_output_coords(output_layout, m->wlr_output,
				&ox, &oy);
		int w = c->xdg_surface->surface->current.width;
		int h = c->xdg_surface->surface->current.height;
		struct wlr_box borders[] = {
			{ox, oy, w + 2 * c->bw, c->bw},             /* top */
			{ox, oy + c->bw, c->bw, h},                 /* left */
			{ox + c->bw + w, oy + c->bw, c->bw, h},     /* right */
			{ox, oy + c->bw + h, w + 2 * c->bw, c->bw}, /* bottom */
		};
		int i;
		for (i = 0; i < sizeof(borders) / sizeof(borders[0]); i++) {
			scalebox(&borders[i], m->wlr_output->scale);
			wlr_render_rect(drw, &borders[i], bordercolor,
					m->wlr_output->transform_matrix);
		}

static const float bordercolor[]    = {0.5, 0.5, 0.5, 1.0};

    - Borders and selected/normal/urgent colors

    - Normal/selected/urgent border colors