diff -up a/config.def.h b/config.def.h
--- a/config.def.h	2020-05-12 02:17:20.070933833 +0200
+++ b/config.def.h	2020-05-13 03:27:51.018695798 +0200
@@ -84,6 +84,9 @@ static Key keys[] = {
 	{ MODKEY,                       XK_period, focusmon,       {.i = +1 } },
 	{ MODKEY|ShiftMask,             XK_comma,  tagmon,         {.i = -1 } },
 	{ MODKEY|ShiftMask,             XK_period, tagmon,         {.i = +1 } },
+	{ MODKEY|ShiftMask,             XK_minus, 		setborderpx,    {.i = -1 } },
+	{ MODKEY|ShiftMask,             XK_plus, 		setborderpx,    {.i = +1 } },
+	{ MODKEY|ShiftMask,             XK_numbersign, 	setborderpx,    {.i = 0 } },
 	TAGKEYS(                        XK_1,                      0)
 	TAGKEYS(                        XK_2,                      1)
 	TAGKEYS(                        XK_3,                      2)
diff -up a/dwm.c b/dwm.c
--- a/dwm.c	2020-05-12 02:17:20.070933833 +0200
+++ b/dwm.c	2020-05-14 00:17:35.047919771 +0200
@@ -119,6 +119,7 @@ struct Monitor {
 	int by;               /* bar geometry */
 	int mx, my, mw, mh;   /* screen size */
 	int wx, wy, ww, wh;   /* window area  */
+	unsigned int borderpx;
 	unsigned int seltags;
 	unsigned int sellt;
 	unsigned int tagset[2];
@@ -196,6 +197,7 @@ static void run(void);
 static void scan(void);
 static int sendevent(Client *c, Atom proto);
 static void sendmon(Client *c, Monitor *m);
+static void setborderpx(const Arg *arg);
 static void setclientstate(Client *c, long state);
 static void setfocus(Client *c);
 static void setfullscreen(Client *c, int fullscreen);
@@ -638,6 +640,7 @@ createmon(void)
 	m->nmaster = nmaster;
 	m->showbar = showbar;
 	m->topbar = topbar;
+	m->borderpx = borderpx;
 	m->lt[0] = &layouts[0];
 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
@@ -1047,7 +1050,7 @@ manage(Window w, XWindowAttributes *wa)
 	/* only fix client y-offset, if the client center might cover the bar */
 	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
 		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
-	c->bw = borderpx;
+	c->bw = c->mon->borderpx;
 
 	wc.border_width = c->bw;
 	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
@@ -1424,6 +1427,40 @@ sendmon(Client *c, Monitor *m)
 }
 
 void
+setborderpx(const Arg *arg)
+{
+	Client *c;
+	int prev_borderpx = selmon->borderpx;
+
+	if (arg->i == 0)
+		selmon->borderpx = borderpx;
+	else if (selmon->borderpx + arg->i < 0)
+		selmon->borderpx = 0;	
+	else
+		selmon->borderpx += arg->i;	
+	
+	for (c = selmon->clients; c; c = c->next)
+	{	
+		if (c->bw + arg->i < 0)
+			c->bw = selmon->borderpx = 0;
+		else
+			c->bw = selmon->borderpx;
+		if (c->isfloating || !selmon->lt[selmon->sellt]->arrange)
+		{
+			if (arg->i != 0 && prev_borderpx + arg->i >= 0)
+				resize(c, c->x, c->y, c->w-(arg->i*2), c->h-(arg->i*2), 0);
+			else if (arg->i != 0)
+				resizeclient(c, c->x, c->y, c->w, c->h);
+			else if (prev_borderpx > borderpx)
+				resize(c, c->x, c->y, c->w + 2*(prev_borderpx - borderpx), c->h + 2*(prev_borderpx - borderpx), 0);
+			else if (prev_borderpx < borderpx)
+				resize(c, c->x, c->y, c->w-2*(borderpx - prev_borderpx), c->h-2*(borderpx - prev_borderpx), 0);
+		}
+	}
+	arrange(selmon);
+}
+
+void
 setclientstate(Client *c, long state)
 {
 	long data[] = { state, None };