.registration-success {
    position: absolute;
    right: 5px;
    top: 5px;
    border: 1px solid green;
    border-radius: 5px;
    background-color: #daf2da;
    z-index: 10;
    padding: .3rem;
    transition: opacity 1s ease-in-out;
}

.registration-success-hidden {
    opacity: 0;
}

@media screen and (max-width: 789px) {
    .registration-success {
        top: 50px;
    }
}