#app-start-loading {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #283542;
    color: white;
    font-size: 16px;
    transition: opacity ease 0.35s;
    z-index: 9999;
}