Seasonals-Halloween/halloween.css

.halloween-container {
    display: block;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.halloween {
    position: fixed;
    bottom: -10%;
    z-index: 0;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-user-select: none;
    cursor: default;
    -webkit-animation-name: halloween-fall, halloween-shake;
    -webkit-animation-duration: 10s, 3s;
    -webkit-animation-timing-function: linear, ease-in-out;
    -webkit-animation-iteration-count: infinite, infinite;
    -webkit-animation-play-state: running, running;
    animation-name: halloween-fall, halloween-shake;
    animation-duration: 10s, 3s;
    animation-timing-function: linear, ease-in-out;
    animation-iteration-count: infinite, infinite;
    animation-play-state: running, running
}

@-webkit-keyframes halloween-fall {
    0% {
        bottom: -10%
    }

    100% {
        bottom: 100%
    }
}

@-webkit-keyframes halloween-shake {

    0%,
    100% {
        -webkit-transform: translateX(0);
        transform: translateX(0)
    }

    50% {
        -webkit-transform: translateX(80px);
        transform: translateX(80px)
    }
}

@keyframes halloween-fall {
    0% {
        bottom: -10%
    }

    100% {
        bottom: 100%
    }
}

@keyframes halloween-shake {

    0%,
    100% {
        transform: translateX(0)
    }

    50% {
        transform: translateX(80px)
    }
}

.halloween:nth-of-type(0) {
    left: 1%;
    -webkit-animation-delay: 0s, 0s;
    animation-delay: 0s, 0s
}

.halloween:nth-of-type(1) {
    left: 10%;
    -webkit-animation-delay: 1s, 1s;
    animation-delay: 1s, 1s
}

.halloween:nth-of-type(2) {
    left: 20%;
    -webkit-animation-delay: 6s, .5s;
    animation-delay: 6s, .5s
}

.halloween:nth-of-type(3) {
    left: 30%;
    -webkit-animation-delay: 4s, 2s;
    animation-delay: 4s, 2s
}

.halloween:nth-of-type(4) {
    left: 40%;
    -webkit-animation-delay: 2s, 2s;
    animation-delay: 2s, 2s
}

.halloween:nth-of-type(5) {
    left: 50%;
    -webkit-animation-delay: 8s, 3s;
    animation-delay: 8s, 3s
}

.halloween:nth-of-type(6) {
    left: 60%;
    -webkit-animation-delay: 6s, 2s;
    animation-delay: 6s, 2s
}

.halloween:nth-of-type(7) {
    left: 70%;
    -webkit-animation-delay: 2.5s, 1s;
    animation-delay: 2.5s, 1s
}

.halloween:nth-of-type(8) {
    left: 80%;
    -webkit-animation-delay: 1s, 0s;
    animation-delay: 1s, 0s
}

.halloween:nth-of-type(9) {
    left: 90%;
    -webkit-animation-delay: 3s, 1.5s;
    animation-delay: 3s, 1.5s
}

.halloween:nth-of-type(10) {
    left: 25%;
    -webkit-animation-delay: 2s, 0s;
    animation-delay: 2s, 0s
}

.halloween:nth-of-type(11) {
    left: 65%;
    -webkit-animation-delay: 4s, 2.5s;
    animation-delay: 4s, 2.5s
}