.headroom {
    will-change: transform;
    transition: transform 200ms linear;
}
.headroom--pinned {
    transform: translateY(0%);
}
.headroom--unpinned {
    transform: translateY(-100%);
}

.headroom--not-top.headroom--pinned{
	box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}