defined current_user and logged_in? as a helper method to use it in a view
redirect to root path if user creation is successful
added css for form fields
use placeholder for form instead of label fields
added a css file for buttons
defined common use color code as a variables
apply button style for submit button in new user view
apply style for radio button
common use font size
apply pointer cursor for submit button
adjust input form style
set sex default value
looked good for new user form
added input tag to css reset tags group
added class to place element into center
adjust form style
defined method do lazy render for stylesheet and javascript tag
for pages css
modified submit button text
defined container