The default grid system provided in Bootstrap utilizes 12 columns that render out at widths of 724px, 940px (default without responsive CSS included), and 1170px. Below 767px viewports, the columns become fluid and stack vertically.
强行以改变自勉 ，或许只能注定在打脸中成长了 。” “我去深圳玩 ，碰到以前百度的哥们 ，结结巴巴地整天跟我说 ，说咱们出海吧 ，我又新弄了一艘快艇 ，赶紧去一下。