基础样式
颜色
文字颜色以.text-*开头
背景颜色.bg-*
primary / seconday / success / danger / warning / info / muted / white / light / dark
文本样式
text-left / text-right / text-center
text-nowrap(文本一行显示) / text-truncate（文本一行显示，超出部分...）
text-lowercase / text-uppercase / text-capitalize (首字母大写)
font-weight-bold / font-weight-normal / font-weight-light / font-italic
text-hide
元素大小
w-25 -> widht:25%
w-50 / w-75 / w-100 / h-25 / h-50 / h-75 / h-100
mw-100 -> max-width:100%
mh-100 -> max-height:100%
间距
m(margin) / p(padding)
l(left) / t(top) / b(bottom) / r(right) / x(left|right) / y(top/bottom)
SIZE:0 / 1 / 2 / 3 / 4 / 5 / auto
case
mt-0 -> margin-top
mx-2 -> margin-left | margin-right
p-2 -> padding
定位
position-relative / position-absolute / position-fixed / position-static / position-sticky
fixed-top
fixed-bottom
sticky-top
Display
d-*
none / block / inline / inline-block / flex / inline-flex
浮动
clearfix
float-left / float-right / float-none
边框
border / border-top / border-right / border-bottom / border-left
border-0 / border-top-0 / border-right-0 / border-bottom-0 / border-left-0
border-primary / border-seconday / border-success / border-danger / border-warning / border-info / border-dark / border-light / border-white
rounded / rounded-circle / rounded-0
组件
按钮