diff --git a/lua/avante/floating_window.lua b/lua/avante/floating_window.lua
index 5878468..edbc271 100644
--- a/lua/avante/floating_window.lua
+++ b/lua/avante/floating_window.lua
@@ -15,6 +15,7 @@ api.nvim_set_hl(namespace, "FloatBorder", { link = "Normal" })
 ---@field on_mount_handlers table | nil
 ---@field on_unmount_handlers table | nil
 ---@field augroup integer | nil
+---@field keep_floating_style boolean | nil
 local FloatingWindow = {}
 FloatingWindow.__index = FloatingWindow
 
@@ -29,6 +30,7 @@ setmetatable(FloatingWindow, {
 ---@field buf_options? table<string, any>
 ---@field win_options? table<string, any>
 ---@field float_options? table<string, any>
+---@field keep_floating_style? boolean
 
 ---@param opts FloatingWindowOptions
 ---@return FloatingWindow
@@ -43,6 +45,7 @@ function FloatingWindow.new(opts)
   instance.on_mount_handlers = {}
   instance.on_unmount_handlers = {}
   instance.augroup = nil
+  instance.keep_floating_style = opts.keep_floating_style or false
   return instance
 end
 
@@ -55,8 +58,8 @@ function FloatingWindow.from_split_win(split_winid, opts)
 
   local calc_floating_win_size = function(width, height)
     return {
-      width = math.max(width - 2, 0),
-      height = math.max(height - 3, 0),
+      width = math.max(width - 2, 1),
+      height = math.max(height - 3, 1),
     }
   end
 
@@ -81,6 +84,7 @@ function FloatingWindow.from_split_win(split_winid, opts)
     buf_options = buf_opts_,
     win_options = win_opts_,
     float_options = float_opts_,
+    keep_floating_style = opts.keep_floating_style,
   })
 
   floating_win:on_mount(function(winid)
@@ -178,7 +182,9 @@ function FloatingWindow:mount()
     api.nvim_set_option_value(option, value, { win = self.winid })
   end
 
-  api.nvim_win_set_hl_ns(self.winid, namespace)
+  if not self.keep_floating_style then
+    api.nvim_win_set_hl_ns(self.winid, namespace)
+  end
 
   for _, handler in ipairs(self.on_mount_handlers) do
     handler(self.winid, self.bufnr)
@@ -220,7 +226,7 @@ function FloatingWindow:on(event, handler, options)
   })
 end
 
----@param mode string check `:h :map-modes`
+---@param mode string|string[] check `:h :map-modes`
 ---@param key string|string[] key for the mapping
 ---@param handler string | fun(): nil handler for the mapping
 ---@param opts? table<"'expr'"|"'noremap'"|"'nowait'"|"'remap'"|"'script'"|"'silent'"|"'unique'", boolean>
diff --git a/lua/avante/highlights.lua b/lua/avante/highlights.lua
index 83c6f2c..72cf0e0 100644
--- a/lua/avante/highlights.lua
+++ b/lua/avante/highlights.lua
@@ -10,6 +10,8 @@ local M = {
   REVERSED_NORMAL = "AvanteReversedNormal",
 }
 
+M.input_ns = api.nvim_create_namespace("avante_input")
+
 M.setup = function()
   local normal = api.nvim_get_hl(0, { name = "Normal" })
   api.nvim_set_hl(0, M.REVERSED_NORMAL, { fg = normal.bg })
@@ -19,6 +21,10 @@ M.setup = function()
   api.nvim_set_hl(0, M.REVERSED_SUBTITLE, { fg = "#56b6c2" })
   api.nvim_set_hl(0, M.THRIDTITLE, { fg = "#ABB2BF", bg = "#353B45" })
   api.nvim_set_hl(0, M.REVERSED_THRIDTITLE, { fg = "#353B45" })
+
+  local normal_float = api.nvim_get_hl(0, { name = "NormalFloat" })
+  api.nvim_set_hl(M.input_ns, "NormalFloat", { fg = normal_float.fg, bg = normal_float.bg })
+  api.nvim_set_hl(M.input_ns, "FloatBorder", { fg = normal.fg, bg = normal.bg })
 end
 
 return M
diff --git a/lua/avante/sidebar.lua b/lua/avante/sidebar.lua
index 09dbd7a..3799643 100644
--- a/lua/avante/sidebar.lua
+++ b/lua/avante/sidebar.lua
@@ -3,7 +3,6 @@ local fn = vim.fn
 
 local Path = require("plenary.path")
 local Split = require("nui.split")
-local Input = require("nui.input")
 local event = require("nui.utils.autocmd").event
 
 local Config = require("avante.config")
@@ -637,71 +636,6 @@ function Sidebar:on_mount()
     end,
   })
 
-  local input_container_win_width = api.nvim_win_get_width(self.input_container.winid)
-  local input_container_win_height = api.nvim_win_get_height(self.input_container.winid)
-
-  api.nvim_create_autocmd("WinResized", {
-    group = self.augroup,
-    callback = function()
-      if
-        not self.input.winid
-        or not self.input_container.winid
-        or not api.nvim_win_is_valid(self.input.winid)
-        or not api.nvim_win_is_valid(self.input_container.winid)
-      then
-        return
-      end
-
-      local current_input_container_win_width = api.nvim_win_get_width(self.input_container.winid)
-      local current_input_container_win_height = api.nvim_win_get_height(self.input_container.winid)
-
-      if
-        current_input_container_win_width == input_container_win_width
-        and current_input_container_win_height == input_container_win_height
-      then
-        return
-      end
-
-      input_container_win_width = current_input_container_win_width
-      input_container_win_height = current_input_container_win_height
-
-      local old_floating_win_options = api.nvim_win_get_config(self.input.winid)
-      local new_floating_win_options = vim.tbl_deep_extend("force", old_floating_win_options, {
-        width = current_input_container_win_width - 2,
-      })
-      api.nvim_win_set_config(self.input.winid, new_floating_win_options)
-    end,
-  })
-
-  local input_win_width = api.nvim_win_get_width(self.input.winid)
-  local input_win_height = api.nvim_win_get_height(self.input.winid)
-
-  api.nvim_create_autocmd("WinResized", {
-    group = self.augroup,
-    callback = function()
-      if
-        not self.input.winid
-        or not self.input_container.winid
-        or not api.nvim_win_is_valid(self.input.winid)
-        or not api.nvim_win_is_valid(self.input_container.winid)
-      then
-        return
-      end
-
-      local current_input_win_width = api.nvim_win_get_width(self.input.winid)
-      local current_input_win_height = api.nvim_win_get_height(self.input.winid)
-
-      if current_input_win_width == input_win_width and current_input_win_height == input_win_height then
-        return
-      end
-
-      input_win_width = current_input_win_width
-      input_win_height = current_input_win_height
-
-      api.nvim_win_set_width(self.input_container.winid, input_win_width + 2)
-    end,
-  })
-
   api.nvim_create_autocmd("WinClosed", {
     group = self.augroup,
     callback = function(args)
@@ -709,13 +643,6 @@ function Sidebar:on_mount()
       if not self:is_focused_on(closed_winid) then
         return
       end
-      if closed_winid == self.winids.input then
-        -- Do not blame me for this hack: https://github.com/MunifTanjim/nui.nvim/blob/61574ce6e60c815b0a0c4b5655b8486ba58089a1/lua/nui/input/init.lua#L96-L99
-        ---@diagnostic disable-next-line: undefined-field
-        if self.input._.pending_submit_value then
-          return
-        end
-      end
       self:close()
     end,
   })
@@ -873,7 +800,6 @@ function Sidebar:resize()
       api.nvim_win_set_width(comp.winid, new_layout.width)
     end
   end
-  self:create_input()
   self:render_result_container()
   self:render_input_container()
   self:render_selected_code_container()
@@ -1129,7 +1055,6 @@ function Sidebar:get_commands()
       ---@diagnostic disable-next-line: unused-local
       callback = function(args, cb)
         local help_text = get_help_text(items)
-        self:create_input()
         self:update_content(help_text, { focus = false, scroll = false })
         if cb then
           cb(args)
@@ -1142,7 +1067,6 @@ function Sidebar:get_commands()
       callback = function(args, cb)
         local chat_history = {}
         save_chat_history(self, chat_history)
-        self:create_input()
         self:update_content("Chat history cleared", { focus = false, scroll = false })
         vim.defer_fn(function()
           self:close()
@@ -1204,7 +1128,7 @@ function Sidebar:create_selected_code()
       win_options = get_win_options(),
       position = "bottom",
       size = {
-        height = selected_code_size,
+        height = selected_code_size + 3,
       },
     })
     self.selected_code_container:mount()
@@ -1288,7 +1212,6 @@ function Sidebar:create_input()
           return
         end
       else
-        self:create_input()
         self:update_content("Unknown command: " .. command, { focus = false, scroll = false })
         return
       end
@@ -1331,7 +1254,6 @@ function Sidebar:create_input()
       })
 
       vim.defer_fn(function()
-        self:create_input() -- Recreate input box
         if self.result and self.result.winid and api.nvim_win_is_valid(self.result.winid) then
           api.nvim_set_current_win(self.result.winid)
         end
@@ -1370,34 +1292,31 @@ function Sidebar:create_input()
     return
   end
 
-  local win_width = api.nvim_win_get_width(self.input_container.winid)
-
-  self.input = Input({
-    relative = {
-      type = "win",
-      winid = self.input_container.winid,
+  self.input = self:create_floating_window_for_split({
+    split_winid = self.input_container.winid,
+    buf_opts = {
+      modifiable = true,
     },
-    position = {
-      row = 2,
-      col = 1,
-    },
-    size = {
-      width = win_width - 2, -- Subtract the width of the input box borders
-    },
-  }, {
-    disable_cursor_position_patch = true,
-    prompt = Config.windows.prompt.prefix,
-    default_value = " ",
-    on_submit = function(user_input)
-      user_input = Utils.trim_spaces(user_input)
-      if user_input == "" then
-        self:create_input()
-        return
-      end
-      handle_submit(user_input)
-    end,
+    keep_floating_style = true,
   })
 
+  self.input:on_mount(function()
+    api.nvim_win_set_hl_ns(self.input.winid, Highlights.input_ns)
+  end)
+
+  local function on_submit()
+    local lines = api.nvim_buf_get_lines(self.input.bufnr, 0, -1, false)
+    local request = table.concat(lines, "\n")
+    if request == "" then
+      return
+    end
+    api.nvim_buf_set_lines(self.input.bufnr, 0, -1, false, {})
+    handle_submit(request)
+  end
+
+  self.input:map("n", "<CR>", on_submit)
+  self.input:map("i", "<C-s>", on_submit)
+
   self.input:mount()
 
   api.nvim_set_option_value("filetype", "AvanteInput", { buf = self.input.bufnr })
@@ -1437,7 +1356,7 @@ function Sidebar:get_selected_code_size()
   if self.code.selection ~= nil then
     local selected_code_lines = vim.split(self.code.selection.content, "\n")
     selected_code_lines_count = #selected_code_lines
-    selected_code_size = math.min(selected_code_lines_count, selected_code_max_lines_count) + 3
+    selected_code_size = math.min(selected_code_lines_count, selected_code_max_lines_count)
   end
 
   return selected_code_size
@@ -1448,6 +1367,7 @@ end
 ---@field buf_opts table | nil
 ---@field win_opts table | nil
 ---@field float_opts table | nil
+---@field keep_floating_style boolean | nil
 
 ---@param opts CreateFloatingWindowForSplitOptions
 function Sidebar:create_floating_window_for_split(opts)
@@ -1492,7 +1412,7 @@ function Sidebar:render()
       filetype = "Avante",
     },
     float_opts = {
-      height = math.max(0, sidebar_height - selected_code_size - 9),
+      height = math.max(1, sidebar_height - selected_code_size - 3 - 8),
     },
   })
 
diff --git a/lua/avante/utils/init.lua b/lua/avante/utils/init.lua
index 754cd7e..f960f03 100644
--- a/lua/avante/utils/init.lua
+++ b/lua/avante/utils/init.lua
@@ -265,6 +265,7 @@ function M.unlock_buf(bufnr)
 end
 
 function M.lock_buf(bufnr)
+  vim.cmd("stopinsert")
   vim.bo[bufnr].modified = false
   vim.bo[bufnr].modifiable = false
 end