$scanning-code-width: 200px
$scanning-code-height: $scanning-code-width/0.785
.page-scanning
  width: $scanning-code-width
  margin-left: auto
  margin-right: auto
  position: relative
  margin-top: 30px
  .scanning-qr-image
    position: absolute
    font-size: $scanning-code-height
    span
      @extend .fa
      @extend .fa-qrcode
  .scanning-laser
    position: absolute
    height: $scanning-code-height
    border-right: 2px solid #f00
    animation-name: scanning
    animation-duration: 1s infinite
    animation-direction: alternate
    animation-timing-function: linear

@keyframes(scanning)
  from
    left: 0
  to
    left: $scanning-code-width