On 27, July, Twitter Bootstrap 3 RC 1 was released, if there are no major bugs found in this release, then it will be the final released Twitter Bootstrap 3 with some minor changes. What changes does Bootstrap 3 have compared to Bootstrap 2? After checking the documents, we can find that there are mainly 3 changes.Embrace flat designIn Bootstrap 3, it begins to embrace flat design. First from the official webpage of Bootstrap 3, we can find elements are flat designed. Also, all buttons have no box shadows now, they are flat and simple. But the flat design is not complete, in some components, w...