#popup-post-realtime {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: blue;
    color: #fff;
    padding: 15px;
    box-shadow: 0 -3px 10px rgba(0,0,0,0.4);
    display: none;
    z-index: 999999;
    font-size: 16px;
    animation: slideUp 0.4s ease-out;
}

#popup-post-realtime .close-btn {
    float: right;
    cursor: pointer;
    font-size: 35px;
    font-weight: bold;
    margin-top: -5px;
    right: 10px;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to   { transform: translateY(0); }
}