.snowflakes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: -1;
}

.snowflake {
    position: absolute;
    top: -10px;
    color: #fff;
    font-size: 1em;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.8);
    animation: fall linear infinite;
    opacity: 0.8;
    user-select: none;
}

@keyframes fall {
    0% {
        top: -10px;
        opacity: 1;
        transform: translateX(0) rotateZ(0deg);
    }
    100% {
        top: 100vh;
        opacity: 0;
        transform: translateX(var(--tx)) rotateZ(360deg);
    }
}

.snowflake.size-1 { font-size: 0.5em; animation-duration: 10s; }
.snowflake.size-2 { font-size: 0.8em; animation-duration: 12s; }
.snowflake.size-3 { font-size: 1em; animation-duration: 14s; }
.snowflake.size-4 { font-size: 1.3em; animation-duration: 16s; }
.snowflake.size-5 { font-size: 1.6em; animation-duration: 18s; }

.snowflake {
    --tx: 0px;
    --sway: 0px;
}

.snowflake.variant-1 { --tx: 50px; }
.snowflake.variant-2 { --tx: -60px; }
.snowflake.variant-3 { --tx: 80px; }
.snowflake.variant-4 { --tx: -45px; }
.snowflake.variant-5 { --tx: 100px; }
.snowflake.variant-6 { --tx: -80px; }
.snowflake.variant-7 { --tx: 40px; }
.snowflake.variant-8 { --tx: -70px; }

.snowflake:nth-child(1) { left: 10%; animation-delay: 0s; }
.snowflake:nth-child(2) { left: 20%; animation-delay: 2s; }
.snowflake:nth-child(3) { left: 30%; animation-delay: 4s; }
.snowflake:nth-child(4) { left: 40%; animation-delay: 1s; }
.snowflake:nth-child(5) { left: 50%; animation-delay: 3s; }
.snowflake:nth-child(6) { left: 60%; animation-delay: 2.5s; }
.snowflake:nth-child(7) { left: 70%; animation-delay: 0.5s; }
.snowflake:nth-child(8) { left: 80%; animation-delay: 3.5s; }
.snowflake:nth-child(9) { left: 90%; animation-delay: 1.5s; }
.snowflake:nth-child(10) { left: 5%; animation-delay: 2.5s; }