Overlay dissolve dissapear

.overlayBox {

1. background: linear-gradient(
   0deg
   ,rgba(255,255,255,1) 0%,rgba(255,255,255,0.9) 60%,rgba(255,255,255,0) 100%);
2. width: 100%;
3. padding-top: 100px;
4. margin-top: -100px;

}