.resp-container { 
  position: relative; 
  overflow: hidden; 
  padding-top: 100%; 
  height: 100%; 
  min-width:100%;
}

.resp-iframe { 
  position: absolute; 
  top: 0; 
  left: 0; 
  width: 100%; 
  height: 100%; 
  border: 0; 
  
}