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

.fog {
    position: absolute;
    top: 0;
    width: 300px;
    height: 100%;
    background: radial-gradient(circle, rgba(255,255,255,0.2), transparent 70%);
    filter: blur(40px);
    animation: moveFog 20s linear infinite;
}

.left {
    left: -100px;
}

.right {
    right: -100px;
}

@keyframes moveFog {
    0% { transform: translateY(0); }
    50% { transform: translateY(50px); }
    100% { transform: translateY(0); }
}