diff --git a/dwm/drw.c b/dwm/drw.c
index 9fdd1a4..5bc9da2 100644
--- a/dwm/drw.c
+++ b/dwm/drw.c
@@ -176,6 +176,9 @@ drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
 	                       DefaultColormap(drw->dpy, drw->screen),
 	                       clrname, dest))
 		die("error, cannot allocate color '%s'", clrname);
+
+	/* alfa opaco: si no, el borde de las ventanas ARGB (st con alpha) sale transparente */
+	dest->pixel |= 0xffU << 24;
 }
 
 /* Create color schemes. */