Sure, so when you want to target a specific section or block, use the ID Finder and put it BEFORE the code you use. Then use the { } to hold the code as usual. So in short itll look like Section/Block { entire code }
In this example, I'll use a block from my own site and it would look like:
//GREYSCALE MOUSEOVER ON SPECIFIC SECTION SIMPLE LIST
section[data-section-id="6635cc2fb4f49d34d81efa34"] {
.list-item-media {
transition: all 1s;
filter:grayscale(1);
}
.list-item:hover .list-item-media {transition: all 1s;
filter:grayscale(0)!important;
}
@media only screen and(max-width:640px){
.list-item-media{
filter:grayscale(0)!important;
}
}
}
Let me know if this works