diff --git a/config.def.h b/config.def.h
index c033162..7218aad 100644
--- a/config.def.h
+++ b/config.def.h
@@ -26,9 +26,9 @@ 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 },
+	/* class      instance    title       tags mask     iscentered   isfloating   monitor */
+	{ "Gimp",     NULL,       NULL,       0,            0,           1,           -1 },
+	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           0,           -1 },
 };
 
 /* layout(s) */
diff --git a/config.h b/config.h
index 027345a..af48a0d 100644
--- a/config.h
+++ b/config.h
@@ -45,14 +45,15 @@ 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 << 1,       0,           -1 },
-	{ "firefox",  NULL,       NULL,       1 << 1,       0,           -1 },
-	{ "discord",  NULL,       NULL,       1 << 2,       0,           -1 },
-	{ "Steam",    NULL,       NULL,       1 << 3,       0,           -1 },
-	{ "Lutris",   NULL,       NULL,       1 << 3,       0,           -1 },
-	{ "UE4Editor",    NULL,       NULL,       1 << 3,       0,           -1 },
+	/* class          instance    title       tags mask     iscentered   isfloating   monitor */
+	{ "Gimp",         NULL,       NULL,       0,            0,           1,           -1 },
+	{ "Alacritty",    NULL,       NULL,       0,            1,           0,           -1 },
+	{ "Firefox",      NULL,       NULL,       1 << 1,       0,           0,           -1 },
+	{ "firefox",      NULL,       NULL,       1 << 1,       0,           0,           -1 },
+	{ "discord",      NULL,       NULL,       1 << 2,       0,           0,           -1 },
+	{ "Steam",        NULL,       NULL,       1 << 3,       0,           0,           -1 },
+	{ "Lutris",       NULL,       NULL,       1 << 3,       0,           0,           -1 },
+	{ "UE4Editor",    NULL,       NULL,       1 << 3,       0,           0,           -1 },
 };
 
 /* layout(s) */
diff --git a/dwm.c b/dwm.c
index 47d4ae5..9e8143c 100644
--- a/dwm.c
+++ b/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, isurgent, neverfocus, oldstate, isfullscreen;
+	int isfixed, iscentered, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
 	Client *next;
 	Client *snext;
 	Monitor *mon;
@@ -137,6 +137,7 @@ typedef struct {
 	const char *instance;
 	const char *title;
 	unsigned int tags;
+	int iscentered;
 	int isfloating;
 	int monitor;
 } Rule;
@@ -293,6 +294,7 @@ applyrules(Client *c)
 	XClassHint ch = { NULL, NULL };
 
 	/* rule matching */
+	c->iscentered = 0;
 	c->isfloating = 0;
 	c->tags = 0;
 	XGetClassHint(dpy, c->win, &ch);
@@ -305,6 +307,7 @@ applyrules(Client *c)
 		&& (!r->class || strstr(class, r->class))
 		&& (!r->instance || strstr(instance, r->instance)))
 		{
+			c->iscentered = r->iscentered;
 			c->isfloating = r->isfloating;
 			c->tags |= r->tags;
 			for (m = mons; m && m->num != r->monitor; m = m->next);
@@ -1088,6 +1091,10 @@ manage(Window w, XWindowAttributes *wa)
 	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)
@@ -1718,6 +1725,17 @@ tile(Monitor *m)
 	if (n == 0)
 		return;
 
+	c = nexttiled(m->clients);
+	if (n == 1 && c && c->iscentered){
+		resize(c, 
+				m->wx + m->ww*(1 - m->mfact)/2,
+				m->wy,
+				m->ww * m->mfact - 2 * m->sel->bw,
+				m->wh - 2 * m->sel->bw, 0
+				);
+		return;
+	}
+
 	if (n > m->nmaster)
 		mw = m->nmaster ? m->ww * m->mfact : 0;
 	else
@@ -1734,6 +1752,13 @@ tile(Monitor *m)
 			if (ty + HEIGHT(c) < m->wh)
 				ty += HEIGHT(c);
 		}
+	if (n == 1 && m->sel->iscentered)
+		resize(m->sel, 
+				(m->wx + m->ww*(1 - m->mfact)/2),
+				m->wy,
+				m->ww * m->mfact - 2 * m->sel->bw,
+				m->wh - 2 * m->sel->bw, 0
+				);
 }
 
 void
@@ -2049,8 +2074,10 @@ 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