.embed-responsive {
    min-width: 640px;
    min-height: 480px;
}
/*.embed-responsive-16by9, .ratio-16x9 {*/
/*    min-width: 720px !important;*/
/*    min-height: 480px !important;*/
/*}*/
/*.embed-responsive-4by3, .ratio-4x3 {*/
/*    min-width: 640px !important;*/
/*    min-height: 480px !important;*/
/*}*/