.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%; 
  border: 0;
}