Sass snippet to create a css banner on (currently) left side of a block element

gistfile1.sass

=banner
  float: none
  position: relative
  width: 20%
  font-size: 1.2em
  font-weight: normal
  padding: 6px 10px 6px 30px
  margin: 0px 10px 10px -30px
  color: #626262
  background-color: darken(#f5f5f5, 10%)
  -webkit-box-shadow: 0px 2px 4px #888
  -moz-box-shadow: 0px 2px 4px #888
  box-shadow: 0px 2px 4px #888
  &:after
    content: ' '
    position: absolute
    width: 0
    height: 0
    left: 0px
    top: 100%
    border-width: 0 10px 10px 0
    border-style: solid
    border-color: #666 #666 transparent transparent
  &.no-float
    float: none!important
    clear: both
h4
  +banner