Bug fix
1. Add <br> to "* required" in studentID
2. Increase the line height of info part
3. Enter the price of one book
Version 1.0.1.0
1. Divide file into .js, .css
2. Set <head> attributes
3. Add deadline text, which will disappear after 3 seconds
4. Use "$nbsp" instead of "."
Version 1.0.1.1
1. Fix the bug of direct submit with !EE, which will show default value of the textbox
Version 1.0.1.2
1. Fix the css bug ( unnecessary <body> )