.Login-form-gradient {}

.Login-form-gradient::before {
    content: "";
    background: linear-gradient(135deg, #fd1d1d, #d62976, #fa7e1e, #f3da75, #48ff00, #00ffd5, #4f5bd5, #7a00ff, #962fbf, #ff0000);
    /* Must have otherwise you won't see the rainbow */
    position: absolute;
    /* rainbow starts from the top */
    top: -5px;
    /* rainbow starts from the left */
    left: -0px;
    background-size: 400%;
    width: 100%;
    /* rainbow height */
    height: 1%;
    animation: moving-gradient 20s linear infinite;
    border-radius: 10px;
}

@keyframes moving-gradient {
    0% {
        background-position: 0 0;
    }
    50% {
        background-position: 400% 0;
    }
    100% {
        background-position: 0 0;
    }
}