Here's another approach using a Modify HTTP Response filter, replacing CSS min with Javascript Math.min, using innerWidth/Height for vw/h and assuming innerWidth*0.64 for 100% width.
CODE:
[["pixabay.com",["/chunk-media_show/",["/\"min\\(.*?\\)([,:}])/","`${Math.min(innerHeight*0.64,e.height)}px`$1","/\"min\\(.*?\\)([,:}])/","`${Math.min(e.Width,innerWidth*0.64)}px`$1","/\"min\\(.*?\\)([,:}])/","`${Math.min(e.width,a/100*innerHeight,innerWidth*0.64)}px`$1"]]]]