html,
body {
    height: 100%;
    margin: 0;
    background: #000;
}

#mediaplayer {
    width: 100%;
    height: 100vh;
}

.div_loader {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000;
    z-index: 20;
}

.alert {
    visibility: hidden;
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    color: #fff;
    background: rgba(0, 0, 0, 0.85);
    text-align: center;
    z-index: 30;
}