body{
    margin: 0;
    min-height: 100vh;
    background: #222;
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-wrap: wrap;
}
#title{
    color: white; 
    font-size: 40px; 
    text-align: center;
    padding: 20px;
}
video-player::part(container){
    max-width: 500px;
}
video-player:nth-of-type(2){
    margin: auto;
}
@media (max-width: 400px) {
    body{
        background: #333;
    }
    #title{
        font-size: 30px;
    }
}
@media (max-height: 400px) {
    .title{
        display: none;
    }
}