    background-image: linear-gradient(45deg, rgba(255, 255, 0, 0.5), rgba(0, 0, 255, 0.5));
            }

            25% {
                background-size: 100% 0%;
                background-image: linear-gradient(45deg, rgba(0, 0, 255, 0.5), rgba(255, 0, 255, 0.5));
            }

            50% {
                background-size: 0% 100%;
                background-image: linear-gradient(45deg, rgba(255, 0, 255, 0.5), rgba(128, 0, 128, 0.5));
            }

            75% {
                background-