section.leaves {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
}

section.leaves div.leaves {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

section.leaves div.leaves div {
    position: absolute;
    display: block;
}

section.leaves div.leaves div:nth-child(1) {
    left: 10%;
    animation: animate 14s linear infinite;
    animation-delay: -7s;
}
section.leaves div.leaves div:nth-child(2) {
    left: 20%;
    animation: animate 21s linear infinite;
    animation-delay: -5s;
}
section.leaves div.leaves div:nth-child(3) {
    left: 30%;
    animation: animate 12s linear infinite;
}
section.leaves div.leaves div:nth-child(4) {
    left: 40%;
    animation: animate 22s linear infinite;
    animation-delay: -5s;
}
section.leaves div.leaves div:nth-child(5) {
    left: 50%;
    animation: animate 13s linear infinite;
    animation-delay: -2s;
}
section.leaves div.leaves div:nth-child(6) {
    left: 60%;
    animation: animate 16s linear infinite;
    animation-delay: -7s;
}
section.leaves div.leaves div:nth-child(7) {
    left: 70%;
    animation: animate 14s linear infinite;
}
section.leaves div.leaves div:nth-child(8) {
    left: 80%;
    animation: animate 19s linear infinite;
    animation-delay: -4s;
}
section.leaves div.leaves div:nth-child(9) {
    left: 90%;
    animation: animate 13s linear infinite;
    animation-delay: -1s;
}


section.leaves div.leaves:nth-child(2) {
    transform: scale(2) rotateY(180deg);
    filter: blur(2px);
}

section.leaves div.leaves:nth-child(3) {
    transform: scale(.8) rotatexY(90deg);
    filter: blur(4px);
}

@keyframes animate {
    0% {
        opacity: 0;
        top: -10%;
        transform: translateX(20px) rotate(0deg);
    }

    10% {
        opacity: 1;
    }
    20% {
        transform: translateX(-20px) rotate(45deg);
    }
    40% {
        transform: translateX(-20px) rotate(90deg);
    }
    60% {
        transform: translateX(-20px) rotate(45deg);
    }
    80% {
        transform: translateX(-20px) rotate(0deg);
    }

    100% {
        top: 110%;
    }
}