.error_box {
    width: 300px;
    padding: 10px;
    background-color: red;
    color: white;
    font-weight: 500;
    text-align: center;
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    top: -50%;
    animation: upside 5s;
    border-radius: 5px;
    box-shadow: 0px 0px 10px black;
    font-size: 12;
}

@keyframes upside {
    0% {
        opacity: 0;
        top: 10%;
    }
    5% {
        opacity: 1;
        top: 10%;
    }

    80% {
        opacity: 1;
        top: 10%;
    }

    100% {
        opacity: 0;
        top: -50%;
    }
}