diff -up dwm-6.2-orig/config.def.h dwm-6.2-modd/config.def.h
--- dwm-6.2-orig/config.def.h	2019-02-02 16:55:28.000000000 +0400
+++ dwm-6.2-modd/config.def.h	2021-04-25 16:05:22.569759243 +0400
@@ -26,9 +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 },
+	/* class      	     instance    title    tags mask     isfloating   CenterThisWindow?     monitor */
+	{ "st",              NULL,       NULL,    0,            0,     	     1,		           -1 },
+	{ "Gimp",            NULL,       NULL,    0,            1,           0,                    -1 },
+	{ "Firefox",         NULL,       NULL,    1 << 8,       0,           0,                    -1 },
 };
 
 /* layout(s) */
diff -up dwm-6.2-orig/dwm.c dwm-6.2-modd/dwm.c
--- dwm-6.2-orig/dwm.c	2019-02-02 16:55:28.000000000 +0400
+++ dwm-6.2-modd/dwm.c	2021-04-25 16:06:15.368310756 +0400
@@ -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, isfloating, isurgent, neverfocus, oldstate, isfullscreen, CenterThisWindow;
 	Client *next;
 	Client *snext;
 	Monitor *mon;
@@ -138,6 +138,7 @@ typedef struct {
 	const char *title;
 	unsigned int tags;
 	int isfloating;
+	int CenterThisWindow;
 	int monitor;
 } Rule;
 
@@ -286,6 +287,7 @@ applyrules(Client *c)
 
 	/* rule matching */
 	c->isfloating = 0;
+        c->CenterThisWindow = 0;
 	c->tags = 0;
 	XGetClassHint(dpy, c->win, &ch);
 	class    = ch.res_class ? ch.res_class : broken;
@@ -298,6 +300,7 @@ applyrules(Client *c)
 		&& (!r->instance || strstr(instance, r->instance)))
 		{
 			c->isfloating = r->isfloating;
+			c->CenterThisWindow = r->CenterThisWindow;
 			c->tags |= r->tags;
 			for (m = mons; m && m->num != r->monitor; m = m->next);
 			if (m)
@@ -1694,6 +1697,13 @@ tile(Monitor *m)
 			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
 			ty += HEIGHT(c);
 		}
+
+	if (n == 1 && selmon->sel->CenterThisWindow)
+        resizeclient(selmon->sel,
+                (selmon->mw - selmon->mw * 0.5) / 2,
+                (selmon->mh - selmon->mh * 0.5) / 2,
+                selmon->mw * 0.5,
+                selmon->mh * 0.5);
 }
 
 void