.hero-section {
  height: 100vh;                 /* full height */
                    /* full width */
  background-image: url("/static/home/images/law.jpg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  position: relative;
  overflow: hidden;              /* ensures no scrollbars from 100vw */
}

.hero-section .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
  z-index: 1;
}
.hero-section .container-fluid {
  position: relative;
  z-index: 2; /* text above overlay */
}