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.
结语 细节之中藏有魔鬼。有的突发奇想 ，现在给狗美容洗澡都要到宠物医院，太麻烦了 ，干脆上门洗狗吧 。