/* Container with aspect ratio preservation */
.iframe-container {
position: relative;
width: 100%;
padding-bottom: 56.25%; /* 16:9 aspect ratio (100% / 16 * 9) */
height: 0;
overflow: hidden;
}
/* Responsive iframe */
.iframe-container iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
border: 0;
}