.microbial_section:before {
  content: "";
  width: 100%;
  height: 220px;
  background-image: url(../images/microbial.png);
  background-repeat: no-repeat;
  background-size: cover;
  position: absolute;
  top: 0;
  z-index: -1;
}
.specialized-card img {
  height: 100px;
}