[TheLastSuperman]

Originally Posted by Seven Skins

Thanks,
But this is making all images gray color .. e.g. rank images, rep images, icons, logo, avatar, etc..

Then we shall change it!

Add this to additional.css instead IF you only wish post images to be grayscale

.postbody img{
   -webkit-filter: grayscale(100%);
  filter: grayscale(100%);
}

.postbody img:hover{
  -webkit-filter: grayscale(0%);
  filter: grayscale(0%);
}