diff --git a/config.def.h b/config.def.h
index 671ae1f..8b868db 100644
--- a/config.def.h
+++ b/config.def.h
@@ -2,6 +2,8 @@
 
 /* appearance */
 static const unsigned int borderpx  = 5;        /* border pixel of windows */
+// add gappx
+static const unsigned int gappx     = 8;
 static const unsigned int snap      = 32;       /* snap pixel */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 0;        /* 0 means bottom bar */
@@ -47,7 +49,7 @@ static const Layout layouts[] = {
 };
 
 /* key definitions */
-#define MODKEY Mod1Mask
+#define MODKEY Mod4Mask
 #define TAGKEYS(KEY,TAG) \
 	{ MODKEY,                       KEY,      view,           {.ui = 1 << TAG} }, \
 	{ MODKEY|ControlMask,           KEY,      toggleview,     {.ui = 1 << TAG} }, \
@@ -117,6 +119,8 @@ static const Key keys[] = {
   { MODKEY|ControlMask,           XK_b,      spawn,          {.v = bgselectcmd } },
   { MODKEY|ControlMask|ShiftMask, XK_a,      spawn,          {.v = audioswitchcmd } },
   { MODKEY|ControlMask|ShiftMask, XK_d,      spawn,          {.v = displayctlcmd } },
+  { MODKEY|ShiftMask,             XK_minus,  setgaps,        {.i = -1 } },
+  { MODKEY|ShiftMask,             XK_equal,  setgaps,        {.i = +1 } },
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
   { MODKEY|ShiftMask,             XK_f,      togglefullscr,  {0} },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
diff --git a/dwm.c b/dwm.c
index 8d7a9f0..692a7e2 100644
--- a/dwm.c
+++ b/dwm.c
@@ -119,6 +119,8 @@ struct Monitor {
 	int by;               /* bar geometry */
 	int mx, my, mw, mh;   /* screen size */
 	int wx, wy, ww, wh;   /* window area  */
+  // add gappx field
+  int gappx;
 	unsigned int seltags;
 	unsigned int sellt;
 	unsigned int tagset[2];
@@ -201,6 +203,8 @@ static void setclientstate(Client *c, long state);
 static void setfocus(Client *c);
 static void setfullscreen(Client *c, int fullscreen);
 static void setlayout(const Arg *arg);
+// declare here
+static void setgaps(const Arg *arg);
 static void setmfact(const Arg *arg);
 static void setup(void);
 static void seturgent(Client *c, int urg);
@@ -656,6 +660,8 @@ createmon(void)
 	m->nmaster = nmaster;
 	m->showbar = showbar;
 	m->topbar = topbar;
+  // add gappx here
+  m->gappx = gappx;
 	m->lt[0] = &layouts[0];
 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
@@ -1498,6 +1504,17 @@ setfocus(Client *c)
 	sendevent(c, wmatom[WMTakeFocus]);
 }
 
+// add setgaps function
+void
+setgaps(const Arg *arg)
+{
+  if ((arg->i == 0) || (selmon->gappx + arg->i < 0))
+    selmon->gappx = 0;
+  else
+    selmon->gappx += arg->i;
+  arrange(selmon);
+}
+
 void
 setfullscreen(Client *c, int fullscreen)
 {
@@ -1537,7 +1554,7 @@ setlayout(const Arg *arg)
 	if (selmon->sel)
 		arrange(selmon);
 	else
-		drawbar(selmon);
+	drawbar(selmon);
 }
 
 /* arg > 1.0 will set mfact absolutely */
@@ -1703,6 +1720,35 @@ tagmon(const Arg *arg)
 	sendmon(selmon->sel, dirtomon(arg->i));
 }
 
+//void
+//tile(Monitor *m)
+//{
+//	unsigned int i, n, h, mw, my, ty;
+//	Client *c;
+//
+//	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
+//	if (n == 0)
+//		return;
+//
+//	if (n > m->nmaster)
+//		mw = m->nmaster ? m->ww * m->mfact : 0;
+//	else
+//		mw = m->ww;
+//	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
+//		if (i < m->nmaster) {
+//			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
+//			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
+//			if (my + HEIGHT(c) < m->wh)
+//				my += HEIGHT(c);
+//		} else {
+//			h = (m->wh - ty) / (n - i);
+//			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
+//			if (ty + HEIGHT(c) < m->wh)
+//				ty += HEIGHT(c);
+//		}
+//}
+
+// new version, previous is above
 void
 tile(Monitor *m)
 {
@@ -1716,18 +1762,18 @@ tile(Monitor *m)
 	if (n > m->nmaster)
 		mw = m->nmaster ? m->ww * m->mfact : 0;
 	else
-		mw = m->ww;
-	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
-		if (i < m->nmaster) {
-			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
-			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
-			if (my + HEIGHT(c) < m->wh)
-				my += HEIGHT(c);
+    mw = m->ww - m->gappx;
+	for (i = 0, my = ty = m->gappx, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
+			if (i < m->nmaster) {
+			h = (m->wh - my) / (MIN(n, m->nmaster) - i) - m->gappx;
+			resize(c, m->wx + m->gappx, m->wy + my, mw - (2*c->bw) - m->gappx, h - (2*c->bw), 0);
+			if (my + HEIGHT(c) + m->gappx < m->wh)
+				my += HEIGHT(c) + m->gappx;
 		} else {
-			h = (m->wh - ty) / (n - i);
-			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
-			if (ty + HEIGHT(c) < m->wh)
-				ty += HEIGHT(c);
+        h = (m->wh - ty) / (n - i) - m->gappx;
+        resize(c, m->wx + mw + m->gappx, m->wy + ty, m->ww - mw - (2*c->bw) - 2*m->gappx, h - (2*c->bw), 0);
+        if (ty + HEIGHT(c) + m->gappx < m->wh)
+          ty += HEIGHT(c) + m->gappx;
 		}
 }