diff --git a/dwm/config.def.h b/dwm/config.def.h
index 6ba495703e7b02b31d60beb313637ca1d45ad658..f139661f178d129e41756dbd4b58e016b2f14fd3 100644
--- a/dwm/config.def.h
+++ b/dwm/config.def.h
@@ -26,10 +26,10 @@ static const Rule rules[] = {
 	 *	WM_CLASS(STRING) = instance, class
 	 *	WM_NAME(STRING) = title
 	 */
-	/* class            instance    title       tags mask     isfloating   monitor */
-	{ "Gimp",           NULL,       NULL,       0,            1,           -1 },
-	{ "Firefox",        NULL,       NULL,       1 << 8,       0,           -1 },
-  { "Avizo-service",  NULL,       NULL,       0,            1,           -1 }
+	/* class            instance    title       tags mask     iscentered   isfloating   canfocus  monitor */
+	{ "Gimp",           NULL,       NULL,       0,            1,           1,           1,        -1 },
+	{ "Firefox",        NULL,       NULL,       1 << 8,       1,           0,           1,        -1 },
+  { "Avizo-service",  NULL,       NULL,       0,            1,           1,           0,        -1 }
 };
 
 /* layout(s) */
diff --git a/dwm/dwm.c b/dwm/dwm.c
index c678e908e0d02eb55ee14d44ceae1a4525594bf3..ba0efb4d1bffb57ed3b5e3b89edac254c611f711 100644
--- a/dwm/dwm.c
+++ b/dwm/dwm.c
@@ -92,7 +92,7 @@ struct Client {
 	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 	int bw, oldbw;
 	unsigned int tags;
-	int isfixed, isfloating, canfocus, isurgent, neverfocus, oldstate, isfullscreen;
+	int isfixed, iscentered, canfocus, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
 	Client *next;
 	Client *snext;
 	Monitor *mon;
@@ -137,8 +137,9 @@ typedef struct {
 	const char *instance;
 	const char *title;
 	unsigned int tags;
+	int iscentered;
 	int isfloating;
-    int canfocus;
+  int canfocus;
 	int monitor;
 } Rule;
 
@@ -286,6 +287,7 @@ applyrules(Client *c)
 	XClassHint ch = { NULL, NULL };
 
 	/* rule matching */
+	c->iscentered = 0;
 	c->isfloating = 0;
     c->canfocus = 1;
 	c->tags = 0;
@@ -299,6 +301,7 @@ applyrules(Client *c)
 		&& (!r->class || strstr(class, r->class))
 		&& (!r->instance || strstr(instance, r->instance)))
 		{
+			c->iscentered = r->iscentered;
 			c->isfloating = r->isfloating;
             c->canfocus = r->canfocus;
 			c->tags |= r->tags;
@@ -800,7 +803,9 @@ focus(Client *c)
 		detachstack(c);
 		attachstack(c);
 		grabbuttons(c, 1);
-		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
+    if (!c->iscentered){
+		  XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
+    }
 		setfocus(c);
 	} else {
 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
@@ -1056,11 +1061,17 @@ manage(Window w, XWindowAttributes *wa)
 
 	wc.border_width = c->bw;
 	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
-	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
+  if (!c->iscentered){
+	  XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
+  }
 	configure(c); /* propagates border_width, if size doesn't change */
 	updatewindowtype(c);
 	updatesizehints(c);
 	updatewmhints(c);
+	if (c->iscentered) {
+		c->x = c->mon->mx + (c->mon->mw - WIDTH(c)) / 2;
+		c->y = c->mon->my + (c->mon->mh - HEIGHT(c)) / 2;
+	}
 	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
 	grabbuttons(c, 0);
 	if (!c->isfloating)
@@ -1757,7 +1768,9 @@ unfocus(Client *c, int setfocus)
 	if (!c)
 		return;
 	grabbuttons(c, 0);
-	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
+  if (!c->iscentered){
+	  XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
+  }
 	if (setfocus) {
 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
@@ -2014,8 +2027,10 @@ updatewindowtype(Client *c)
 
 	if (state == netatom[NetWMFullscreen])
 		setfullscreen(c, 1);
-	if (wtype == netatom[NetWMWindowTypeDialog])
+	if (wtype == netatom[NetWMWindowTypeDialog]) {
+		c->iscentered = 1;
 		c->isfloating = 1;
+	}
 }
 
 void