@charset "utf-8";
/* CSS Document */

.tube {
position:relative;
width:100%;
height: 0;
padding-top:calc(9 / 16 * 100%);
margin: 0 auto 2rem;
overflow: hidden;
}
.tube iframe{
position:absolute;
top:0;
right:0;
width:100%;
height:100%;
}