.c16.res-video-iframe-4x3 {
 
    padding-bottom: 56.25%;
    overflow: hidden;
    box-sizing: border-box;
    position: relative;
width:100%;

}
.c16.res-video-iframe-4x3 iframe{
    position:absolute;
top:0;
left:0;
width:100%;
height:100%
border:0;
}


/*4:3影片設定*/
.c4.res-video-iframe-4x3 {
 
    padding-bottom: 75.2%;
    overflow: hidden;
    box-sizing: border-box;
    position: relative;
width:100%;
}
.c4.res-video-iframe-4x3 iframe{
  position:absolute;
top:0;
left:0;
width:100%;
height:100%
border:0;
}