To access the login page, simply right click on it and select 'view source'. Copy the code into a notepad and save it as an html file. Within this code, there are various operations such as signup and password help all on one page. Your task is to locate the login section within the code and remove everything else. Only preserve the specified style sheets provided below. Feel free to customize these files according to your needs.
<link rel="stylesheet" type="text/css" href="https://secure.assets.tumblr.com/stylesheets/compressed/global.css?cb1e8b42147f30c2e13d62135690991a"><link rel="stylesheet" type="text/css" href="https://secure.assets.tumblr.com/stylesheets/compressed/onboarding.css?1adfaf6588f389f7567dae907f646280"><link rel="stylesheet" type="text/css" href="https://secure.assets.tumblr.com/stylesheets/compressed/dashboard.css?bccedfaa1a01c28c280ee47200935a38"><link rel="stylesheet" type="text/css" href="https://secure.assets.tumblr.com/stylesheets/compressed/hello_tags.css?17d5a86bd54c60a37ef98400e6b86b4c"><link rel="stylesheet" type="text/css" href="https://secure.assets.tumblr.com/stylesheets/compressed/notification_new.css?9003193efe4adc94a3d8c85421fa6403">
Once you have isolated the login section in the html code, you will have a login page similar to Tumblr's.