:root {
    --twinkle-duration: 2s;
}

.stars {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    animation: twinkle var(--twinkle-duration) ease-in-out infinite;
}

.stars:nth-child(2) {
    animation-delay: calc(var(--twinkle-duration) * -0.33);
}

.stars:nth-child(3) {
    animation-delay: calc(var(--twinkle-duration) * -0.66);
}

@keyframes twinkle {
    25% {
        opacity: 0;
    }
}

.star {
    fill: white;
}

.star:nth-child(3n) {
    opacity: 0.8;
}

.star:nth-child(7n) {
    opacity: 0.6;
}

.star:nth-child(13n) {
    opacity: 0.4;
}

.star:nth-child(19n) {
    opacity: 0.2;
}

.comet {
    transform-origin: center center;
    animation: comet 10s linear infinite;
}

@keyframes comet {
    0%,
    40% {
        transform: translateX(0);
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    60%,
    100% {
        transform: translateX(-100vmax);
        opacity: 0;
    }
}

.comet-b {
    animation-delay: -3.3s;
}

.comet-c {
    animation-delay: -5s;
}

@media screen and (max-width: 960px) {
    .star:nth-child(even) {
        display: none;
    }
}