@keyframes fadein {
    from {
      opacity:0;
    }
    to {
        opacity:1;
    }
  }
  body{
    animation: fadein 1.5s !important;
    -moz-animation: fadein 1.5s; /* Firefox */
    -webkit-animation: fadein 1.5s; /* Safari and Chrome */
    -o-animation: fadein 1.5s; /* Opera */
  }