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<style>

  #logo {

    animation: siski 5s infinite ease-in-out;

padding-bottom: 150px;

margin-bottom: 100px;

  }

  @keyframes siski {

    0% {background: url(https://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Pornhub-logo.svg/1200px-Pornhub-logo.svg.png) no-repeat center center;}

    90% {background: url(https://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Pornhub-logo.svg/1200px-Pornhub-logo.svg.png) no-repeat center center;}

    95% {background: url(https://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Pornhub-logo.svg/1200px-Pornhub-logo.svg.png) no-repeat center center;}

    96% {background: url(http://img.eronrg.com/gallery/3058/big/siskegirls_ru_img_6.jpg) no-repeat center center;}

    100% {background: url(http://img.eronrg.com/gallery/3058/big/siskegirls_ru_img_6.jpg) no-repeat center center;}

  }

</style>