diff --git a/src/wofi.c b/src/wofi.c
index e4d6088..8bf5ae8 100644
--- a/src/wofi.c
+++ b/src/wofi.c
@@ -401,6 +401,17 @@ static void expand(GtkExpander* expander, gpointer data) {
 	gtk_widget_set_visible(box, !gtk_expander_get_expanded(expander));
 }
 
+static void update_surface_size(void) {
+	if(wl != NULL) {
+		zwlr_layer_surface_v1_set_size(wlr_surface, width, height);
+		wl_surface_commit(wl_surface);
+		wl_display_roundtrip(wl);
+	}
+
+	gtk_window_resize(GTK_WINDOW(window), width, height);
+	gtk_widget_set_size_request(scroll, width, height);
+}
+
 static void widget_allocate(GtkWidget* widget, GdkRectangle* allocation, gpointer data) {
 	(void) data;
 	if(max_height > 0) {
@@ -421,14 +432,8 @@ static void widget_allocate(GtkWidget* widget, GdkRectangle* allocation, gpointe
 	} else {
 		max_height = allocation->height;
 	}
-	if(wl != NULL) {
-		zwlr_layer_surface_v1_set_size(wlr_surface, width, max_height * lines);
-		wl_surface_commit(wl_surface);
-		wl_display_roundtrip(wl);
-	}
-
-	gtk_window_resize(GTK_WINDOW(window), width, max_height * lines);
-	gtk_widget_set_size_request(scroll, width, max_height * lines);
+	height = max_height * lines;
+	update_surface_size();
 }
 
 static gboolean _insert_widget(gpointer data) {
@@ -1293,8 +1298,10 @@ static void get_output_pos(void* data, struct zxdg_output_v1* output, int32_t x,
 
 void wofi_init(struct map* _config) {
 	config = _config;
-	width = strtol(config_get(config, "width", "1000"), NULL, 10);
-	height = strtol(config_get(config, "height", "400"), NULL, 10);
+	char* width_str = config_get(config, "width", "1000");
+	char* height_str = config_get(config, "height", "400");
+	width = strtol(width_str, NULL, 10);
+	height = strtol(height_str, NULL, 10);
 	x = map_get(config, "x");
 	y = map_get(config, "y");
 	bool normal_window = strcmp(config_get(config, "normal_window", "false"), "true") == 0;
@@ -1363,9 +1370,11 @@ void wofi_init(struct map* _config) {
 	gtk_window_resize(GTK_WINDOW(window), width, height);
 	gtk_window_set_resizable(GTK_WINDOW(window), FALSE);
 	gtk_window_set_decorated(GTK_WINDOW(window), FALSE);
+
+	GdkDisplay* disp = gdk_display_get_default();
+	GdkWindow* gdk_win = gtk_widget_get_window(window);
 	if(!normal_window) {
 		wl_list_init(&outputs);
-		GdkDisplay* disp = gdk_display_get_default();
 		wl = gdk_wayland_display_get_wl_display(disp);
 		struct wl_registry* registry = wl_display_get_registry(wl);
 		struct wl_registry_listener listener = {
@@ -1404,7 +1413,6 @@ void wofi_init(struct map* _config) {
 			}
 		}
 
-		GdkWindow* gdk_win = gtk_widget_get_window(window);
 		gdk_wayland_window_set_use_custom_surface(gdk_win);
 		wl_surface = gdk_wayland_window_get_wl_surface(gdk_win);
 
@@ -1417,6 +1425,22 @@ void wofi_init(struct map* _config) {
 		wl_display_roundtrip(wl);
 	}
 
+	bool width_percent = strchr(width_str, '%') != NULL;
+	bool height_percent = strchr(height_str, '%') != NULL;
+	if(width_percent || height_percent) {
+		GdkMonitor* monitor = gdk_display_get_monitor_at_window(disp, gdk_win);
+		GdkRectangle rect;
+		gdk_monitor_get_geometry(monitor, &rect);
+		if(width_percent) {
+			width = (width / 100.f) * rect.width;
+		}
+		if(height_percent) {
+			height = (height / 100.f) * rect.height;
+		}
+		update_surface_size();
+	}
+
+
 	outer_box = gtk_box_new(outer_orientation, 0);
 	gtk_widget_set_name(outer_box, "outer-box");
 	gtk_container_add(GTK_CONTAINER(window), outer_box);