.leaf-container {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 1;
            /* sau navbar thì dùng 1 */
        }

        .leaf {
            position: absolute;
            top: -50px;
            width: 30px;
            height: auto;
            opacity: 0.8;
            animation: fall linear infinite;
        }

        @keyframes fall {
            0% {
                transform: translateY(0) rotate(0deg);
                opacity: 0.8;
            }

            100% {
                transform: translateY(100vh) rotate(360deg);
                opacity: 0;
            }
        }