@keyframes imgblur {
  0% {filter:blur(12px);}
  15% {filter:blur(10px);}
  30% {filter:blur(8px);}
  45% {filter:blur(6px);}
  60% {filter:blur(4px);}
  75% {filter:blur(2px);}
  100% {filter:blur(0);}
}

.responsive-image.img-blur {filter:blur(15px); animation-name: imgblur; animation-duration: 1s; animation-iteration-count: infinite; animation-direction: alternate;}