CSS for Image overlay mobile ONLY

SS 7.1

https://www.tsiricos.gr/en/real-estate

From image / Design / Overlay I picked the multiply effect to apply to the house picture ( #block-a64da1b3f8db225771f8 ) . Trying, but failing, to exclude with CSS this effect from Desktop view (or apply to mobile only, whatever comes easier).  Also tried but failed to manually add the overlay form scratch so had to go through the SS engine.

*IF* I get this right, the relevant code from chrome inspection is the following but I cant figure how to modify it OR the correct addresses.

Help is appreciated

        .sqs-block-image .sqs-block-content {
          height: 100%;
          width: 100%;
        }
      

      
        .fe-block-a64da1b3f8db225771f8 .fluidImageOverlay {
          position: absolute;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
          mix-blend-mode: multiply;
          
            
            
          
          
            opacity: 1;
          
        }

To exclude desktop, change code to this

@media screen and (max-width:767px) {
 .sqs-block-image .sqs-block-content {
          height: 100%;
          width: 100%;
        }
      

      
        .fe-block-a64da1b3f8db225771f8 .fluidImageOverlay {
          position: absolute;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
          mix-blend-mode: multiply;
          
            
            
          
          
            opacity: 1;
          
        }
}

Not that easy this one @tuanphan

I had to use the SS engine to insert the overlay in the picture.  The code I provided is what I estimate to be relevant code as it the only reference I found in my code with "overlay" in. copy/pasting it though in CSS and adding a simple media screen width wont work.  I am therefore assuming that, unless we can manually with CSS stop the overlay effect from displaying in mobile, we must then cancel it altogether and write the entire thing is CSS. So far I havent been able to limit the engine effect to mobile view only, nor have I managed to write code in order to simulate that effect and insert the media screen switch