diff --git a/lua/chadrc.lua b/lua/chadrc.lua
index 97a3bc2..70e04b2 100644
--- a/lua/chadrc.lua
+++ b/lua/chadrc.lua
@@ -5,7 +5,7 @@
 local M = {}
 
 M.ui = {
-  theme = "yoru",
+  theme = "gatekeeper",
 
   hl_override = {
     Comment = { italic = true },
diff --git a/lua/mappings.lua b/lua/mappings.lua
index 783b78f..6606cab 100644
--- a/lua/mappings.lua
+++ b/lua/mappings.lua
@@ -4,6 +4,12 @@ require "nvchad.mappings"
 
 local map = vim.keymap.set
 
+-- disable arrow keys
+map("n", "<Up>", "<nop>")
+map("n", "<Down>", "<nop>")
+map("n", "<Left>", "<nop>")
+map("n", "<Right>", "<nop>")
+
 map("n", ";", ":", { desc = "CMD enter command mode" })
 map("i", "jk", "<ESC>")
 
diff --git a/lua/options.lua b/lua/options.lua
index fe818df..f16fbd4 100644
--- a/lua/options.lua
+++ b/lua/options.lua
@@ -3,6 +3,10 @@ require "nvchad.options"
 -- add yours here!
 vim.opt.mouse = ""
 
+-- tabsize
+vim.opt.shiftwidth = 4
+vim.opt.tabstop = 4
+
 vim.api.nvim_create_autocmd({ "BufReadPost", "BufNewFile" }, {
   once = true,
   callback = function()