.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 400px;
  background: rgb(2,0,36);
  background: linear-gradient(180deg, rgba(0,0,0,1) 0%, rgba(0,212,255,0) 100%);
}
.scrolled {
  background: #000
}