body{
    margin: 0;
    padding: 0;
    background-image: url(./img/background.jpg);
    background-size: cover;
}
.rain{
    height: 100vh;
    background-image: url(./img/rain.png);
    animation: rain 0.3s linear infinite;
}
@keyframes rain {
    0%{
        background-position: 0% 0%;
    }
    100%{
        background-position: 20% 100%;
    }
}
.rain::before{
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: url(./img/lightining.png);
    top: -100px;
    transform: rotate(180deg);
    animation: lightining 4s linear infinite;
    opacity: 1;

}
@keyframes lightining {
    0%{
        opacity: 0;
    }
    20%{
        opacity: 0;
    }
    21%{
        opacity: 1;
    }
    25%{
        opacity: 0;
    }
    30%{
        opacity: 0;
    }
    31%{
        opacity: 1;
    }
    35%{
        opacity: 0;
    }
    100%{
        opacity: 0;
    }
}