.about-bg {
    position: relative;
    height: 70vh;
    width: 100%;
    background: url(../img/cyber-security/mobile-app-security-header.jpeg)
      center center no-repeat;
    background-size: cover;
    z-index: 1;
  }
  .about-bg::after {
    content: " ";
    position: absolute;
    z-index: -1;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.3);
  }
  .pentration-methedology-img img {
    width: 100%;
    margin-bottom: 2em;
  }