@media (max-width: 550px) { .big-container { display: none; } } @media (min-width: 550px) { .small-container { display: none; } } /* Responsive iFrame */ .responsive-iframe-container { position: relative; padding-bottom: 56.25%; padding-top: 30px; height: 0; overflow: hidden; } .responsive-iframe-container iframe, .responsive-iframe-container object, .responsive-iframe-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }