.b-price__old{
    width: -moz-fit-content;
    width: fit-content;
    position: relative;

  }

    .b-price__old:after{
      content: "";
      position: absolute;
      width: 100%;
      right: 0;
      top: 50%;
      height: 2px;
      background-color: #F04438;
    }