.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0% {
        transform: translateY(0) translateX(0);
        opacity: 1;
    }
    100% {
        transform: translateY(-1000px) translateX(200px);
        opacity: 0;
    }
}