[REFACTOR] cleanup image_tag
transition page background should be white is beauty than black.

before: http://gyazo.com/8ae9d0282bcf5348d0d553dbbdbf4d9a
after: http://gyazo.com/7e3522a52d83a8860dedb2cf843043f9
Merge pull request #78 from iiirc/modify-beautiful-transition-page

Modify beautiful transition page