.slider h3,
.slider h5,
.clients h3 {
    text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}

html {
  scroll-behavior: smooth;
}

section[id]:before {
  display: block;
  height: 50px;   /* equal to the header height */
  margin-top: -50px;  /* negative margin equal to the header height */
  visibility: hidden;
  content: "";
}

.slider img {
    height: 710px;

}

.parallax-container {
    height: 20%;
}

.parallax img {
    filter: grayscale(1);
    opacity: 0.5 !important;
}

.clients img {
    max-width: 150px;
    filter: drop-shadow(1px 1px 1px rgba(0,0,0,0.8));
}

.material-icons {
    font-family: 'Material Icons';
    font-weight: normal;
    font-style: normal;
    font-size: 24px;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-feature-settings: 'liga';
    -webkit-font-smoothing: antialiased;
}

.promo i {
    margin: 40px 0;
    color: #555;
    font-size: 7rem;
    display: block;
}