.particle-container {
    position: fixed;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    z-index: -1;
    background: linear-gradient(to bottom, #f5a9b8, #5bcefa);
}

.particle {
    position: absolute;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
}