.notifier {

    position: absolute;

    left: 50%;

    transform: translate(-50%, 0%);

    width: calc(100% - 20px);
    max-width: 300px;
    height: 60px;

    line-height: 60px;
    text-align: center;

    font-weight: bold;
    font-size: 18px;

    border-radius: 30px;
    background-color: #fff;
    color: #000;

}

.notifier-hidden {

    top: -200px;

}

.notifier-present {

    top: 20px;

}