nałożenie lini na tło strony


body
    &::before, &::after
      content: ''
      height: 100%
      position: absolute
      top: 0
      z-index: -1
      border-left: 1px solid #D8D8D8
      border-right: 1px solid #D8D8D8
      opacity: 0.2
    &::before
      width: 10.83%
      left: 24.06%
    &::after
      width: 17.55%
      right: 17.66%