body {
  background: #ffffff;
  padding: 50px 0;
}
.my-container-gray {
  position: relative;
  background: #f1f3f4;
  overflow: hidden;
}

.my-container-gray h1 {
  font-family: arial;
  padding: 80px;
  text-align: center;
  z-index: 2;
  position: relative;
  color: #2D3439;
}
.my-container-gray img {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: auto;
  z-index: 1;
  opacity: .8;
  mix-blend-mode: overlay;
  filter: grayscale(100%);
}
.my-container-teal {
  position: relative;
  background: #0f7f85;
  overflow: hidden;
}
.my-container-teal h1 {
  font-family: arial;
  padding: 80px;
  text-align: center;
  z-index: 2;
  position: relative;
  color: #fff;
}
.my-container-teal img {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: auto;
  z-index: 1;
  opacity: 0.2;
  mix-blend-mode: overlay;
  filter: grayscale(100%);
}

article {
  background: #fff;
  padding: 15px;
}