iframe[data-tec-events-ece-iframe="true"] { width: 100%; height: calc( 100vw + 100px ); max-width: 100%; } @media screen and (min-width: 600px) { iframe[data-tec-events-ece-iframe="true"] { height: 100vw; } } @media screen and (min-width: 853px) { iframe[data-tec-events-ece-iframe="true"] { height: 1065px; } }