.embed-container { 
    position: relative; 
    padding-bottom: 56.25%; 
    height: 0; overflow: hidden; 
    max-width: 100%; height: auto; 
} 
.embed-container iframe, .embed-container object, .embed-container embed { 
   position: absolute; 
   top: 0; 
   left: 0; 
   width: 100%; 
   height: 100%; 
}