*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}
body{
    font-family:Arial,Helvetica,sans-serif;
    background:#fff;
}
.container{
    max-width:900px;
    margin:auto;
    padding:25px;
}
h1{
    font-size:48px;
    margin-bottom:25px;
}
img{
    width:100%;
    margin-top:25px;
    display:block;
}
.next{
    text-align:center;
    margin:50px 0;
}
.next a{
    font-size:28px;
    text-decoration:none;
    color:#000;
    font-weight:bold;
}

/* Thanh tua nằm riêng 1 hàng, full-width như YouTube */
.plyr__controls {
    flex-wrap: wrap !important;
}

.plyr__progress {
    order: -1;
    flex-basis: 100% !important;
    width: 100% !important;
    margin-bottom: 8px;
}

.plyr__controls__item.plyr__progress__container {
    flex: 1 1 100% !important;
    width: 100% !important;
}