.animated-gradient {
    background: linear-gradient(
            -45deg,
            #423F6A,
            #808080,
            #D3D3D3,
            #A9A9A9
    );
    background-size: 400% 400%;
    animation: gradient 15s ease infinite;
}

@keyframes gradient {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}