Background Animation of Gifts Falling/style.css
body{
    margin: 0;
    padding: 0;
    overflow: hidden;
}

section{
    width: 100%;
    height: 100%;
    background: radial-gradient(#333,#000);
}
img{
    width: 60px;
}
.set{
    position: absolute;
    width: 100%;
    height: 100%;
    
    top: 0;
    left: 0;


}
.set div{
    position: absolute;
    display: block;
}
.set div:nth-child(1){
    left: 3%;
    animation: animate 9s linear infinite;
}
.set div:nth-child(2){
    left: 10%;
    animation-delay: -3s;
    animation: animate 8s linear infinite;


}
.set div:nth-child(3){
    left: 35%;
    animation-delay: -5s;
    animation: animate 6s linear infinite;

}
.set div:nth-child(4){
    left: 20%;
    animation-delay: -7s;
    animation: animate 7s linear infinite;

}.set div:nth-child(5){
    animation: animate 6s linear infinite;
    animation-delay: -9s;

    left: 27%;
}
.set div:nth-child(6){
    left: 48%;
    animation-delay: -11s;
    animation: animate 11s linear infinite;

}.set div:nth-child(7){
    left: 65%;
    animation: animate 14s linear infinite;
    animation-delay: -3s;

}.set div:nth-child(8){
    left: 73%;
    animation: animate 6s linear infinite;
    animation-delay: -5.5s;

}.set div:nth-child(9){
    left: 80%;
    animation: animate 5.5s linear infinite;
    animation-delay: -1.7s;

}.set div:nth-child(10){
    left: 86%;
    animation: animate 3s linear infinite;

}.set div:nth-child(11){
    left: 91%;
    animation: animate 8s linear infinite;

}.set div:nth-child(12){
    left: 96%;
    animation: animate 5s linear infinite;

}.set div:nth-child(13){
    left: 57%;
    animation: animate 12s linear infinite;
    animation-delay: -0.95s;

}
@keyframes animate{
    0%{
        opacity: 0;
        top: -10%;
        transform: translateX(-20px) rotate(85deg);
    } 
    10%{
        opacity: 1;
    } 
    20%{
        transform: translateX(-20px) rotate(60deg);
    }
    40%{
        transform: translateX(-20px) rotate(40deg);
    }
    50%{
        transform: translateX(-20px) rotate(30deg);
    }
    60%{
        transform: translateX(-20px) rotate(15deg);
    }
    80%{
        transform: translateX(-20px) rotate(0deg);
    }
    100%{
        top: 110%;
    }
}
.set2{
    transform: scale(2) rotateY(180deg);
    
}
.set3{
    transform: scale(0.8) rotateX(190deg);
}

@media(max-width:40px){
    img{
        width:40px;
    }
}