.slider h3,
.slider h5,
.clients h3 {
  text-shadow: 2px 2px 3px rgb(0, 0, 0);
}

.parallax-container {
  height: 550px;
}
.parallax img {
  filter: grayscale(1);
  opacity: 0.5 !important;
}
section,
footer {
  padding: 20px 0;
}