.BG_image{
          background-size: cover;
          background-repeat: no-repeat;
          background-position: 50% 50%;
        }

        .margin-center{
          margin:auto;
        }

       [data-section="S01"] .mainBG::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 60%;
        background: linear-gradient(to top, rgba(0,0,0,0.72) 0%, transparent 100%);
        pointer-events: none;
      }