.bc-grained{
position: relative;
height: 500px;
width: 100%;
background: grey;
}
.bc-grained__child {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
pointer-events: none;
opacity: 0.05;
}
[bc-grained__to-hide]{
opacity: 0;
}