diff --git a/nvim/init.vim b/nvim/init.vim
index 5456024..86fb3b8 100644
--- a/nvim/init.vim
+++ b/nvim/init.vim
@@ -31,17 +31,8 @@ filetype plugin indent on
 " Set shift width to 4 spaces.
 set shiftwidth=4
 
-" Set tab width to 4 columns.
-set tabstop=4
-
-" Use space characters instead of tabs.
-set expandtab
-
-" Do not save backup files.
-set nobackup
-
 " Do not let cursor scroll below or above N number of lines when scrolling.
-set scrolloff=10
+set scrolloff=5
 
 " Do not wrap lines. Allow long lines to extend as far as the line goes.
 set nowrap
@@ -59,9 +50,6 @@ set smartcase
 " Show partial command you type in the last line of the screen.
 set showcmd
 
-" Show the mode you are on the last line.
-set showmode
-
 " Show matching words during a search.
 set showmatch
 
@@ -119,17 +107,14 @@ imap <C-j> <Plug>(coc-snippets-expand-jump)
 xmap <leader>x  <Plug>(coc-convert-snippet)
 
 " #####################################################
-" <Tab>: completion
-inoremap <silent><expr> <Tab>
-    \ pumvisible() ? "\<C-N>" :
-    \ s:check_back_space() ? "\<Tab>" :
-    \ coc#refresh()
-" <S-Tab>: completion back
-inoremap <silent><expr> <S-Tab> pumvisible() ? "\<C-P>" : "\<C-H>"
-" <CR>: confirm completion, or insert <CR>
-inoremap <expr> <CR> pumvisible() ? "\<C-Y>" : "\<CR>"
 
 function! s:check_back_space() abort
     let col = col('.') - 1
     return !col || getline('.')[col - 1] =~ '\s'
 endfunction
+
+inoremap <expr> <Tab> coc#pum#visible() ? coc#pum#next(1) : "\<Tab>"
+inoremap <expr> <S-Tab> coc#pum#visible() ? coc#pum#prev(1) : "\<S-Tab>"
+
+" <CR>: confirm completion, or insert <CR>
+inoremap <expr> <CR> pumvisible() ? "\<C-Y>" : "\<CR>"