Fade to black image hero straps

vignette.sass

// defines .row--hero class for edgless, fade to black image straps

=edgeless-background($image)
  background: -moz-linear-gradient(left,  rgba(0,0,0,1) 0%, rgba(0,0,0,1) 10%, rgba(0,0,0,0) 30%, rgba(0,0,0,0) 70%, rgba(0,0,0,1) 90%, rgba(0,0,0,1) 100%), url($image) no-repeat center top /* FF3.6+ */
  background: -webkit-gradient(linear, left top, right top, color-stop(0%,rgba(0,0,0,1)), color-stop(10%,rgba(0,0,0,1)), color-stop(30%,rgba(0,0,0,0)), color-stop(70%,rgba(0,0,0,0)), color-stop(90%,rgba(0,0,0,1)), color-stop(100%,rgba(0,0,0,1))), url($image) no-repeat center top /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(left,  rgba(0,0,0,1) 0%,rgba(0,0,0,1) 10%,rgba(0,0,0,0) 30%,rgba(0,0,0,0) 70%,rgba(0,0,0,1) 90%,rgba(0,0,0,1) 100%), url($image) no-repeat center top /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(left,  rgba(0,0,0,1) 0%,rgba(0,0,0,1) 10%,rgba(0,0,0,0) 30%,rgba(0,0,0,0) 70%,rgba(0,0,0,1) 90%,rgba(0,0,0,1) 100%), url($image) no-repeat center top /* Opera 11.10+ */
  background: -ms-linear-gradient(left,  rgba(0,0,0,1) 0%,rgba(0,0,0,1) 10%,rgba(0,0,0,0) 30%,rgba(0,0,0,0) 70%,rgba(0,0,0,1) 90%,rgba(0,0,0,1) 100%), url($image) no-repeat center top /* IE10+ */
  background: linear-gradient(to right,  rgba(0,0,0,1) 0%,rgba(0,0,0,1) 10%,rgba(0,0,0,0) 30%,rgba(0,0,0,0) 70%,rgba(0,0,0,1) 90%,rgba(0,0,0,1) 100%), url($image) no-repeat center top /* W3C */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#000000', endColorstr='#000000',GradientType=1 )
  background-size: 1850px
  background-position: center top
  background-color: black

.row--hero
  .row__inner
    height: 500px
    line-height: 500px
    > *
      line-height: 1.45em