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

.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));
}