.uif-btn
  display inline-block
  margin-bottom 0
  font-weight 400
  text-align center
  vertical-align middle
  touch-action manipulation
  cursor pointer
  background-image none
  white-space nowrap
  user-select none
  border-radius 0
  transition color .2s linear,background-color .2s linear,border .2s linear,box-shadow .2s linear
  outline 0
  border 1px solid transparent
  s-ellipsis()
  font-size 12px
  line-height 20px
  & > span
    display inline-block
  &-loading
    position relative
    & > span
    .uif-i
      visibility hidden
  .uif-i.uif-btn-icon-loading
    border-radius 50%
    position absolute
    left 50%
    top 50%
    margin -8px 0 0 -8px
    visibility visible
    width 16px
    line-height @width
    height @width
    text-align center
    font-size 16px
    animation s-rotate 2s infinite
    animation-timing-function linear
    transform-origin center center