.blog-list-banner{
  background-image: url(../images/about/unique-dental-banner.jpg);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  position: relative;
  z-index:2;
  padding: 170px 0;
}

.blog-list-banner::after{
  position: absolute;
  top: 0;
  left: 0;
  content: '';
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 3;
}

.blog-list-banner .container{
  z-index: 9;
}