.offline-message,
.online-message {
    position: fixed;
    z-index: 10000;
    top: 0;
    right: 0;
    left: 0;
    margin: 0;
    padding: 0 16px;
    transform: translateY(-200%);
    color: #fff;
    font-size: 12px;
    font-weight: 900;
    line-height: 55px;
    text-align: center;
    transition: transform 300ms ease;
    box-shadow: 0 5px 18px rgba(0, 0, 0, .22);
}

.offline-message { background: #ff6060; }
.online-message { background: #1ecc33; }

.offline-message-active,
.online-message-active { transform: translateY(0); }