This is a very good and simple example to control all of the other checkbox like gmail.
Label tag has been initialized with "masterCheckBoxCon" class and input element has been initialized with "masterCheckbox" id. Which will fire a "change" event. So to grab this element "masterCheckbox" id has been set.
Side pusher hamburger menu is a better way put more content on the page.
Validate email field by regular expression
Very smooth parallax effect on mouse movement