Dear @anamsp
If you need the colour overlay on hover it gets a bit more tricky as this is a <span> overlay - to get all the effects without the colouring:
.special:hover{
filter: blur(2px);
-webkit-filter: blur(2px);
-moz-filter: blur(2px);
-ms-filter: blur(2px);
-o-filter: blur(2px);
opacity: 0.5;
transition: all 400ms ease-out;
}
When you want the image to act the same as project Thumbnails when hovered > right-click & give it a 'custom class' in my example i gave it
special
The above code can be added to 'CSS' in customizer or through ' Lay Options - Custom CSS & HTML'
Hope this helps @anamsp & have a wonderful day, sorry for the delay!
Best
Richard