diff --git a/lua/peek/config.lua b/lua/peek/config.lua
index 15ca57e..19dc792 100644
--- a/lua/peek/config.lua
+++ b/lua/peek/config.lua
@@ -10,6 +10,7 @@ local config = {
   throttle_time = 'auto',
   app = 'webview',
   filetype = { 'markdown' },
+  user_style = nil,
 }
 
 local function optional(predicate)
@@ -54,21 +55,18 @@ end
 function module.setup(incoming)
   incoming = incoming or {}
 
-  vim.validate({
-    config = { incoming, 'table' },
-  })
+  vim.validate('config', incoming, 'table')
 
-  vim.validate({
-    close_on_bdelete = { incoming.close_on_bdelete, 'boolean', true },
-    auto_load = { incoming.auto_load, 'boolean', true },
-    syntax = { incoming.syntax, 'boolean', true },
-    theme = { incoming.theme, optional(one_of({ 'dark', 'light' })), '"dark" or "light"' },
-    update_on_change = { incoming.update_on_change, 'boolean', true },
-    throttle_at = { incoming.throttle_at, 'number', true },
-    throttle_time = { incoming.throttle_time, optional(one_of({ 'auto', of_type('number') })), '"auto" or number' },
-    app = { incoming.app, optional(one_of({ of_type('string'), every(of_type('string')) })), 'string or string[]' },
-    filetype = { incoming.filetype, optional(every(of_type('string'))), 'string[]' },
-  })
+  vim.validate('close_on_bdelete', incoming.close_on_bdelete, 'boolean', true)
+  vim.validate('auto_load', incoming.auto_load, 'boolean', true)
+  vim.validate('syntax', incoming.syntax, 'boolean', true)
+  vim.validate('theme', incoming.theme, optional(one_of({ 'dark', 'light' })), '"dark" or "light"')
+  vim.validate('update_on_change', incoming.update_on_change, 'boolean', true)
+  vim.validate('throttle_at', incoming.throttle_at, 'number', true)
+  vim.validate('throttle_time', incoming.throttle_time, optional(one_of({ 'auto', of_type('number') })), '"auto" or number')
+  vim.validate('app', incoming.app, optional(one_of({ of_type('string'), every(of_type('string')) })), 'string or string[]')
+  vim.validate('filetype', incoming.filetype, optional(every(of_type('string'))), 'string[]')
+  vim.validate('user_style', incoming.user_style, optional(of_type('string')), 'string')
 
   config = vim.tbl_extend('force', config, incoming)
 end
diff --git a/lua/peek/init.lua b/lua/peek/init.lua
index 3378d3c..9dfe681 100644
--- a/lua/peek/init.lua
+++ b/lua/peek/init.lua
@@ -14,7 +14,12 @@ local module = {}
 local augroup, throttle_at, throttle_time, initialized
 
 local function get_buf_content(bufnr)
-  return concat(nvim_buf_get_lines(bufnr, 0, -1, false), '\n'):gsub('%s*$', '')
+  local content = concat(nvim_buf_get_lines(bufnr, 0, -1, false), '\n'):gsub('%s*$', '')
+  local user_style = config.get('user_style')
+  if user_style ~= nil then
+    content = concat({"<style>", user_style , "</style>\n", content})
+  end
+  return content
 end
 
 local function open(bufnr)