hexo-theme-stellar/source/css/_plugins/lazyload.styl

img.lazy
  &:not(.loaded)
    opacity: 0
  &.loaded,&.error
    opacity: 1
  if hexo-config('plugins.lazyload.transition') == 'blur'
    trans1 all 0.75s
    &:not(.loaded)
      filter blur(50px)
      -webkit-filter blur(50px)
    &.loaded,&.error
      filter none
      -webkit-filter none
  else
    trans1 all 0.38s