.err{
    position: sticky;
    top: 0;
    left: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(255, 0, 0, 0.692);
    height: 5rem;
    width: 100%;
    border-radius: 5px;
    margin: 0 0 1rem 0;
    z-index: 999;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}
.err span{
    color:#ffffff;
    font-size: 2rem;
}