/* Animation */
@keyframes mask {
  0% {
    -webkit-mask-position: 120%;
    mask-position: 120%;
    /*opacity: 0;*/
  }
  100% {
    -webkit-mask-position: 0;
    mask-position: 0;
    /*opacity: 1;*/
  }
}

/* Animation usage */
.logo img {
  -webkit-mask-image: linear-gradient(-75deg, #000 25%, rgba(0,0,0,.1) 50%, #000 75%);
  mask-image: linear-gradient(-75deg, #000 25%, rgba(0,0,0,.1) 50%, #000 75%);
  -webkit-mask-size: 800%;
  mask-size: 800%;
  -webkit-mask-position: 120%;
  mask-position: 120%;
  animation: mask 5s ease 2 forwards;
  animation-delay: 0.1s;
}