Simple project with javascript, css and jQuery

• lib： jQuery
• css: font awesome

box-shadow property enables you to cast a drop shadow from the frame of almost any element.

li:nth-child(2n) every even level to do something.

box-sizing: border-box limit the border of input including the padding and textline.

input:focus focus meanings when click the input

display: inline-block attention

opacity the level you can see it

$(something).on("click") is better than $(something).click(function(){}) because when add some new object belongs to something, the function can work as well eg. $("ul").on("click", ".deleteButton", function (event)