.youtube-container 
{
    width: 100%;
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
}

.youtube-container iframe,.youtube-container object,.youtube-container embed 
{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding-left: 10%;
    padding-right: 10%;
    padding-top: 5%;
    padding-bottom: 10%;
}